COMPOSITION of Ratios, is the adding of ratios together: which is performed by multiplying together their corresponding terms, viz. the antecedents together, and the consequents together, for the antecedent and consequent of the compound ratio; like as the addition of logarithms is the same thing as the multiplication of their corresponding numbers. Or, if the terms of the ratios be placed fraction-wise, then the addition or composition of the ratios is performed by multiplying the fractions together.