## The Doctrine of Proportion Clearly Developed: On a Comprehensive, Original, and Very Easy System; Or, The Fifth Book of Euclid Simplified |

### From inside the book

Page 2

Several definitions have been given of the term “ ratio ; " the following are quoted from some of the best writers on proportion :“ Ratio

Several definitions have been given of the term “ ratio ; " the following are quoted from some of the best writers on proportion :“ Ratio

**is a mutual relation of two magnitudes of the same kind to one another , in respect of quantity**.### What people are saying - Write a review

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### Other editions - View all

The Doctrine of Proportion Clearly Developed: On a Comprehensive, Original ... Oliver Byrne No preview available - 2014 |

The Doctrine of Proportion Clearly Developed: On a Comprehensive, Original ... Oliver Byrne No preview available - 2018 |

### Common terms and phrases

a b c d Algebraical Exposition antecedent application Arches Architect Architectural Arithmetical Arts Bridge Buildings changed cloth common measure complete consequent considered constant construction contains continued definition demonstrations difference ditto divided doctrine Drawings edition Elements Engineering equal equimultiples Euclid's evident exactly example expressed fifth definition folio four magnitudes fourth fraction geometrical geometry greater ratio greatest Illustration incommensurable infer inversely Iron kind length less lettered London manner Mathematical measure Mechanics multiple Observations plates Practical present prime PROP proportionals proposition quantities Railway rank ratio compounded readily reasoning relation remainder Reports represent respect Roads Science second and fourth shown sixth square Steam student supposed Tables taken term THEO third tion Treatise twice vary Views Volume whole

### Popular passages

Page 10 - The first of four magnitudes is said to have the same ratio to the second, which the third has to the fourth, when any...

Page 2 - Ratio is the relation which one quantity bears to another of the same kind, the comparison being made by considering what multiple, part, or parts, one quantity is of the other.

Page 58 - IF there be any number of magnitudes, and as many others, which, taken two and two, in a cross order, have the same ratio; the first shall have to the last of the first magnitudes the same ratio which the first of the others has to the last. NB This is usually cited by the words

Page 62 - If there be any number of magnitudes, and as many others, which, taken two and two in order, have the same ratio ; the first shall have to the last of the first magnitudes, the same ratio which the first of the others has to the last. NB This is usually cited by the words "ex sequali,

Page 18 - IF the first be the same multiple of the second, or the same part of it, that the third is of the fourth ; the first is to the second, as the third is to the fourth...

Page 32 - THAT magnitude which has a greater ratio than another has to the same magnitude, is the greater of the two : and that magnitude, to which the same has a greater ratio than it has to another magnitude, is the less of the two.

Page 21 - IF the first be to the second as the third to the fourth, and if the first be a multiple, or part of the second; the third is the same multiple, or the same part of the fourth...

Page 55 - IF there be three magnitudes, and other three, which, taken two and two, have the same ratio ; if the first be greater than the third, the fourth shall be greater than the sixth ; and if equal, equal ; and if less, less...

Page 14 - IF one magnitude be the same multiple of another, which a magnitude taken from the first is of a magnitude taken from the other ; the remainder shall be the same multiple of the remainder, that the whole is of the whole.

Page 73 - L : and the same thing is to be understood when it is more briefly expressed, by saying A has to D the ratio compounded of the ratios of E to F, G to H, and K to L. In like manner, the same things being supposed, if M has to N the same ratio which A has to D ; then, for shortness...