Ratio Proportion and Geometric Mean

Find the geometric mean of 12 and 27

• 18

• 20

• 19.5

• 13.5

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

If there are 5 soccer players, 10 baseball players, and 15 basketball players, what is the ratio of baseball players to soccer players?

• to 2

• to 3

• to 1

• to 1

Solve the proportion.

• k=5

• k=3.3333333

• k=60

• k=90

Solve the proportion.

• q=2

• q=9

• q=4.5

• q=6

Find the ratio in simplest form of the width to the length.

• 6:10

• 3 to 5

• 60

• 12/20

The perimeter of a rectangle in 154 ft. The ratio of length to width is 10:1. Find the length and width.

• l=140
  w=14

• l=70
  w=7

• l=7
  w=70

• l=14
  w=140

In an animal shelter, the ratio of dogs to cats is 5 to 3. There are 25 dogs.  Write and solve a proportion to find the number c of cats.

• c=15

• c=18

• c=21

• c=16

A comparison of two quantities by division is a _____.

• scale factor

• extremes of a proportion

• proportion

• ratio

The positive number x such that a/x = x/b

• Geometric Mean

• Scale Factor

• Scale Drawing

• Means of a proportion