Proportions

Front

What is a proportion?

Back

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

Front

How do you solve for x in a proportion?

Back

To solve for x in a proportion, cross-multiply the ratios and then isolate x.

Front

If a baseball player makes 4 hits in every 7 times at bat, what is the ratio of hits to at-bats?

Back

The ratio of hits to at-bats is 4:7.

Front

If 14 sticks of pepperoni are needed for 28 pizzas, how many sticks are needed for 1 pizza?

Back

For 1 pizza, you need 0.5 sticks of pepperoni.

Front

What is the cross-multiplication method?

Back

The cross-multiplication method involves multiplying the numerator of one ratio by the denominator of the other ratio.

Front

If x/20 = 3/15, what is the value of x?

Back

x = 4.

Front

What does it mean if two ratios do not form a proportion?

Back

It means that the two ratios are not equivalent.

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

If a recipe requires 2 cups of flour for every 3 cups of sugar, what is the ratio of flour to sugar?

Back

The ratio of flour to sugar is 2:3.

Front

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

Back

The formula is a/b = c/d, where you can find the missing value by cross-multiplying.