Proportions

Proportions

Multiply the cross products to determine if the ratios are equal.

Another example:

For the following slides, use the cross products method and determine if the ratios are equal or not.

Multiple Choice

 $\frac{4}{7}=\frac{2}{4}$  

• True

• False

Multiple Choice

 $\frac{2}{3}=\frac{4}{6}$  

• True

• False

Multiple Choice

 $\frac{4}{8}=\frac{3}{6}$  

• True

• False

Multiple Choice

What number would make this a true statement?

• 1

• 3

• 9

• 8

Pause to watch the

solving proportions

video.

Solve the proportions for the following slides.

Multiple Choice

 $\frac{4}{5}=\frac{8}{x}$  

• x = 8

• x = 10

• x = 4

• x = 5

Multiple Choice

 $\frac{x}{5}=\frac{8}{10}$  

• x=7

• x=4

• x=2

• x=3

Multiple Choice

 $\frac{25}{1}=\frac{x}{3}$  

• x=75

• x=50

• x=27

• x=43

Multiple Choice

• x = 16

• x = 28

• x = 1/26

• x = 26

Multiple Choice

• x = 6

• x = 25

• x = 28

• x = 17

Multiple Choice

• c = 4

• c = 8

• c = 14

• c = 10

Multiple Choice

What is a proportion?

• When two ratios can be simplified
• When two ratios are equivalent and show the same value
• When two ratios have the exact same numbers
• When two ratios can be multiplied by 2