Proportions

Front

What is a proportion?

Back

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

Front

How do you set up a proportion?

Back

To set up a proportion, you can use the formula a/b = c/d, where a, b, c, and d are numbers.

Front

If 12 ounces of shampoo lasts 16 weeks, how long will 18 ounces last?

Back

24 weeks.

Front

What is the cross-multiplication method in solving proportions?

Back

Cross-multiplication involves multiplying the numerator of one ratio by the denominator of the other ratio.

Front

Solve for x: 4/x = 2/8

Back

x = 16.

Front

If a tree is 12 feet tall and casts a shadow of 9 feet, what is the height of a building that casts a shadow of 24 feet?

Back

32 feet.

Front

What is the unit rate?

Back

The unit rate is a comparison of two different quantities when they are combined together.

Front

If 3 pounds of hamburger costs $6, how much does 10 pounds cost?

Back

$20.

Front

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

Back

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

Front

How can proportions be used in real-life situations?

Back

Proportions can be used to compare prices, determine distances, and scale models.