Proportions

A proportion is an equality between two ratios.

Proportions

Constant of Proportionality

Constant of Proportionality

Properties of Proportions

In a proportion, the product of the means equals the product of the extremes (cross multiplication).

Properties of Proportions

Properties of Proportions

In a proportion of two or more equal ratios, the sum of the antecedents divided by the sum of the consequents is equal to any one of the ratios.

Equal Ratios

Equal Ratios

If the means and extremes in a proportion swap positions, the proportion does not vary.

Means and Extremes