Ch 4 Writing and Solving 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 to convert feet to yards?

Back

To convert feet to yards, use the ratio 1 yard = 3 feet. For example, to convert 63 feet to yards, write the proportion: 63 feet / x yards = 3 feet / 1 yard.

Front

What is the solution to the proportion 63 feet = x yards?

Back

21 yards.

Front

What is a ratio?

Back

A ratio is a comparison of two quantities, showing how many times one value contains or is contained within the other.

Front

How do you find the ratio of birds to total animals if there are 4 birds and 6 snakes?

Back

The ratio of birds to total animals is 4:10.

Front

What is the ratio of chocolate donuts to glazed donuts if Donald's Donuts makes 7 chocolate donuts for every 13 glazed donuts?

Back

The ratio of chocolate to glazed donuts is 7:13.

Front

How do you express the ratio of dogs to all pets if there are 2 dogs, 4 cats, and 5 hamsters?

Back

The ratio of dogs to all pets is 2:11.

Front

What is the first step in solving a proportion?

Back

The first step is to cross-multiply the two ratios.

Front

If k/3 = 15/5, what is the value of k?

Back

k = 5.

Front

What does it mean if two ratios are equivalent?

Back

It means that they represent the same relationship between quantities.