Proportions

Front

What is a proportion?

Back

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

Front

How do you write a proportion from a word problem?

Back

Identify the two ratios in the problem and set them equal to each other.

Front

If the ratio of dogs to cats is 5 to 3 and there are 25 dogs, how many cats are there?

Back

c = 15

Front

What is the formula to find the total cost when given a price per pound?

Back

Total Cost = Price per Pound × Number of Pounds.

Front

If hamburger sells for 3 pounds for $6, how much will 10 pounds cost?

Back

$20

Front

What does it mean to solve for x in an equation?

Back

It means to find the value of x that makes the equation true.

Front

Back

x = 5

Front

What is the cross-multiplication method in proportions?

Back

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

Front

Back

x = 5

Front

How do you find the expected number of items based on a ratio?

Back

Use the ratio to set up a proportion with the total number of items.