Lesson 2.3: Proportional Tables

Definitions:

Proportion: A proportion is an equation that relates equivalent ratios.

Proportional Relationships: Two sets are in a proportional relationship if all of the ratios that relate the quantities are equivalent.

Example:

The amount of seed a landscaper uses and the area of lawn covered have a
proportional relationship. Complete the table.

Seed (oz)

2

3

4

Area Covered

50

75

100

Area Covered
Seed

Example:

Is the relationship between the number of slices of salami in a sandwich and the
number of Calories proportional? Explain.

Slices

Calories

1

66

2

96

3

126

4

156

Example:

Do the two tables show the same proportional relationship between x and y?
Explain how you know.

x

y

160

360

500

1125

1200

2700

x

y

2

4.5

5

11.25

7

15.75