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 Everyday Examples
 Rate:  A comparison of two quantities that have different units of measure.
For example, the amount of flour and sugar in a recipe for cookies are a proportional relationship. Suzanne wants to bake four batches of cookies. Her recipe says that 1 cup of flour and 2 cups of sugar are needed to make 1 batch of cookies. In order to quadruple the recipe, Suzanne must multiply the quantity of every ingredient by four.

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After multiplying the original quantities by four, Suzanne is left with the proportion

The ratios of flour to sugar for the cookie receipe are in a proportional relationship with one another since they form equal ratios.