Lesson 3.3 Writing and Solving Proportions Practice

Front

What is a proportion?

Back

A proportion is an equation that states that two ratios are equal. For example, if a/b = c/d, then a, b, c, and d are in proportion.

Front

How do you set up a proportion to solve a problem?

Back

To set up a proportion, identify two ratios that relate to the problem. Write them as a fraction and set them equal to each other.

Front

If I walked 15 miles in 2.5 hours, how do I find out how many miles I walked in 4 hours?

Back

Front

What is the cross-multiplication method in proportions?

Back

Front

How do you find the cost of 20 mangoes if 8 mangoes cost $10?

Back

Front

What does it mean for two ratios to form a true proportion?

Back

Front

How can you determine if a pair of ratios does NOT form a true proportion?

Back

Calculate the cross-products of the ratios. If they are not equal, then the ratios do not form a true proportion.

Front

If 4 DVDs cost $48, how do you write a proportion to find the cost of 6 DVDs?

Back

Front

What is the ratio of seventh-grade dancers to all dancers if it is given as 5:16?

Back

This means for every 5 seventh-grade dancers, there are 16 total dancers.

Front

How do you find the number of seventh-grade dancers in a team of 80 dancers?

Back