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Proportions

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To solve proportions, one must know how to work with fractions, set up ratios, cross multiply, and solve one-step algebraic equations. The document provides three examples: a baking recipe that requires 2 1/4 cups of sugar for 60 club members, a weather problem that finds 1.5 inches of snow fell per hour, and a currency conversion that determines $120 is equal to 40 pesos at an exchange rate of $3 to 1 peso.

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Proportions in the Real World
What skills do we need to solve proportions?You must know how to…..Work with fractionsSet up ratiosCross multiplySolve one step algebraic equations
Example 1: BakingYou’ve decided to make chocolate chip cookies for the math club! The recipe calls for ¾ cups of sugar and the recipe makes 20 cookies. The math club has 60 members! How much sugar will you need? If you are going to give 1 cookie to each member.
and theansweris ….2 1/4
WeatherA snowstorm dumped 18 inches of snow in a 12-hour period. How many inches were falling per hour?
Theansweris 1.5 inches
CurrencyYou are going to a trip to Argentina! The currency in Argentina is the Peso. The exchange rate is approximately $3 = 1 Peso. At this rate, how many Pesos would you get if you exchanged $120 ?
Theansweris 40 pesos

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Proportions