Proportion Word Problems

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 for word problems?

Back

Identify the two quantities that are being compared and set them equal to each other in fraction form.

Front

What is the cross-multiplication method?

Back

Cross-multiplication is a method used to solve proportions by multiplying the numerator of one fraction by the denominator of the other.

Front

If a recipe calls for 2 cups of flour for every 3 cups of sugar, how much flour is needed for 9 cups of sugar?

Back

6 cups of flour.

Front

What is the scale factor in enlargement?

Back

The scale factor is the ratio of the dimensions of the enlarged figure to the original figure.

Front

If a painting is enlarged from a width of 3 in. to 15 in., what is the scale factor?

Back

5 (15 in. ÷ 3 in. = 5).

Front

How do you find the expected value in a survey?

Back

Multiply the proportion of the sample by the total number of people in the larger group.

Front

If 30 out of 50 students like pizza, what is the proportion of students who like pizza?

Back

0.6 or 60%.

Front

What is the formula to find the total number of items sold based on a rate?

Back

Total items sold = (Rate of items sold) x (Total time period).

Front

If Krystle sold 56 subscriptions in 72 days, how many would she sell in 216 days?

Back

168 subscriptions.