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

You’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.

Baking

Example 1:

and the answer is …. 2 1/4

Weather

• A snowstorm dumped 18 inches of snow in a 12-hour period. How many inches were falling per hour?

The answer is 1.5 inches

You 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 ?

Currency

The answer is 40 pesos