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(7) 50. If the exponent be equal the ratios will be equal; & the unclear from the comparison of which unclear equal exponents arrise will be proportional, according to § 47. or form an Analogy (§ 54)

59. The ratio of two quantities is not changed by by their being multiplied or divided by the same quantity.

For if a/b = c/d it is also try that am/bm = c/d. Because if a/b = c/d, then ad = bc (§ 51) But if ad = bc then adm = bcm (§ 35) ANd if adm unclear then am:bm::c:d. (§ 53) Or am/bm = c/d. unclear

60. A ratio is said to be the underline inverse /underline of another when the antecedent of one is to its consequent as the consequent of the other is to its antecedent