Lesson 3.2: Connect Percent and Proportion

Lesson 3.2

Connect Percent and Proportion

Definition:

Key Concept:

In this section we will learn how to write a percent proportion. We will then use this to be able to find percentages of numbers or find what percent a ratio is. We can use a percent equation to find either the percent, the part or the whole.

​Solve the problems using percent proportions:

​1. 2% of 180

.

.

.

.

2. What percent is 17 out of 40?

Multiple Choice

Write a percent proportion for 4% of 500

• $$\frac{4}{500}=\ \frac{x}{100}$$

• $$\frac{x}{4}=\frac{100}{500}$$

• $$\frac{4}{100}=\frac{x}{500}$$

• $$\frac{4}{100}=\frac{500}{x}$$

Multiple Choice

Find 4% of 500

• 2,000

• 200

• 125

• 20

​Example: The rabbit population on a farm is 200% the population of last year. If there are now 1,100 rabbits this year, how many were there last year?

Example: You bought a house for $240,000 with a down
payment of $60,000:

●Their down payment is what percentage of the purchase price?

●What percent of the purchase would a $12,000 down payment be?

Multiple Choice

What percent of $40,000 is $500?

• 1.25%

• 80%

• 8000%

• 0.0125%

Multiple Choice

What percent of 400 is 20?

• 5%

• 50%

• 20%

• 2%

​Conclusion: Write two complete sentences about what you learned.