Ratios and Proportions

Solve the proportion.

• k=5

• k=3.3333333

• k=60

• k=90

What is a Ratio?

• Is a comparison of two quantities 

• To multiply two fractions 

• A number over another number

• Two decimals that can be multiplied

Charlie Browns Christmas tree is 18 inches tall. The Christmas tree at Mr.Bass' house is 8 ft tall. What is the ratio of Charlie Browns tree to Mr. Bass' Tree?

• 18/8

• 8/18

• 3/16

• 16/3

A class has 30 students. 18 are boys. What is the ratio of boys to girls?

• 12:18

• 3:2

• 30:18

• 18:7

There are 80 students in Mr. Bass’ classes.  The ratio of boys to girls is 2 : 3.
How many boys are in the classes?
How many girls?

• Boys: 32
  Girls: 48

• Boys: 48
  Girls: 32

• Boys: 5
  Girls: 15

• Boys: 15
  Girls: 5

Solve for x

• x=1

• x=3

• x=3/5

• x=2

Solve for x

• x=6.5

• x=8

• x=4

• x=5.5

Solve the proportion:

• 4

• 8

• 14

• 10

Two numbers are in the ratio 7 : 9. If the sum of the numbers is 112, then the larger number is

• 49

• 72

• 63

• 42

Which of these ratios is equivalent to 3:4?

• 12:9

• 9:20

• 9:12

• 803:804