Ratio and Proportion

Ratio and Proportion

Objective: Find equivalent ratio and proportions

​Vocabulary

Ratio: represents the amount of one quantity in comparison to another quantity.

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​For example: the ratio of males to females in the English class was 3:5.

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​This means for every 3 males there are 5 females.

​Example

Fill in the Blanks

The ratio of female cops to male cops in the police department is 2:5. What would the ratio of male cops to all cops in the department be?

(your answer should be written as #:#)

​Vocabulary

​Example

Multiple Choice

Is the ratio an equivalent proportion?

$$\frac{8}{9}=\frac{32}{36}$$  

• YES

• NO

​Example

Fill in the Blanks

What value for x would make an equivalent proportion?

$\frac{4}{x}=\frac{12}{21}$  

​Example

The ratio of female nurses to male nurses at a certain hospital is 5 to 3, and there are actually 20 female nurses at the hospital. How many male nurses are there?

Fill in the Blanks

8 plates cost 48 dollars. How much do 20 plates cost?

Fill in the Blanks

12 miles is approximately equal to 6 km. How many km are equal to 18 miles?

Fill in the Blanks

Mr. Jose divided his money in the ratio of 5:2 between Brian and Bogie. Brian got the smaller amount of $156. How much did Bogie receive?

(be careful about how you set it up)