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product of the unclear Thus if fg = hl unclear For Divid. by g) unclear formula dividing by h) formula Therefore f:d::l:g because if f/h = l/g the ratio of f to unclear same as unclear] at of l to g by § 49.

54. Proportion to unclear called underline arelogy; /underline & when the proportion is used simply it is always understood of geometrical proportion. The like is to be observed of ratio, as before mention'd § 46.

55. From addition what /addition has been said it appears that the ratio between two quantities a & b is discovered by dividing a by b; & this quotient is called the underline exponent of the ratio. /underline Thus a/b is the exponent of the ratio of a to b; & on the