Multistep Proportions

Front

What is a proportion?

Back

A proportion is an equation that states that two ratios are equal.

Front

How do you solve a proportion?

Back

To solve a proportion, cross-multiply the two ratios and then solve for the unknown variable.

Front

What does it mean if two ratios form a proportion?

Back

It means that the two ratios are equivalent, meaning they represent the same relationship.

Front

If a:b = c:d, what is the cross-multiplication rule?

Back

The cross-multiplication rule states that a*d = b*c.

Front

What is the first step in solving a multistep proportion problem?

Back

Identify the ratios and set up the proportion equation.

Front

If Gracie has 24 cookies for 3 classes, how many cookies per class does she have?

Back

8 cookies per class.

Front

If Gracie needs to bring cookies for 4 classes, how many cookies does she need if she brings 8 per class?

Back

32 cookies.

Front

What is the relationship between equivalent ratios?

Back

Equivalent ratios have the same value when simplified.

Front

How can you check if two ratios form a proportion?

Back

You can check by cross-multiplying and seeing if the products are equal.

Front

What is the formula for finding a missing value in a proportion?

Back

If a/b = c/x, then x = (b*c)/a.