Proportions

Front

What is a proportion?

Back

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

Front

How do you determine if two ratios are proportional?

Back

Two ratios are proportional if their cross products are equal.

Front

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

Back

If a/b = c/d, then ad = bc, where a, b, c, and d are numbers.

Front

If a recipe requires 5 cups of flour for 10 servings, how much flour is needed for 15 servings?

Back

7.5 cups of flour.

Front

What is the relationship between ratios and proportions?

Back

Ratios compare two quantities, while proportions show that two ratios are equal.

Front

If 12 apples cost $3, how much do 20 apples cost?

Back

$5.

Front

What is the cross-multiplication method used for?

Back

It is used to determine if two ratios are proportional by multiplying the means and extremes.

Front

What is an example of a direct proportion?

Back

If the number of hours worked increases, the amount of pay increases at a constant rate.

Front

What is an example of an inverse proportion?

Back

If the speed of a car increases, the time taken to travel a fixed distance decreases.

Front

How can proportions be used in real-life situations?

Back

Proportions can be used in cooking, budgeting, and scaling models.