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Proposition and Ratio Fractions

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Proposition and Ratio Fractions

Fractions and ratios illustration

📊 Part 1: Understanding Proportions

1. Which proportion is correct?

2/3 = 4/6

1/2 = 3/5

3/4 = 6/7

5/8 = 10/15

2. If 3/5 = x/15, what is the value of x?

6

9

12

15

3. A recipe calls for 2 cups of flour for every 3 cups of sugar. If you use 6 cups of flour, how many cups of sugar do you need?

4 cups

6 cups

9 cups

12 cups

4. Which ratios are equivalent to 4:6? (Check all that apply)

2:3

8:12

6:9

12:18

✏️ Part 2: Solving Proportions

5. Solve for y: 7/y = 14/20

Show your work:

Answer: y = _______

6. In a classroom, the ratio of boys to girls is 3:5. If there are 15 girls, how many boys are there?

Set up the proportion:

Answer: _______ boys

7. Complete the proportion: 12/16 = _____/4

Answer: _______

8. A car travels 240 miles in 4 hours. At this rate, how far will it travel in 7 hours?

Write and solve the proportion:

Answer: _______ miles

Answer Key - Proposition and Ratio Fractions

Answer key illustration

📊 Part 1: Understanding Proportions - ANSWERS

1. Which proportion is correct?

Answer: 2/3 = 4/6 (Cross multiply: 2×6 = 12, 3×4 = 12)

2. If 3/5 = x/15, what is the value of x?

Answer: 9 (Cross multiply: 3×15 = 45, 45÷5 = 9)

3. A recipe calls for 2 cups of flour for every 3 cups of sugar. If you use 6 cups of flour, how many cups of sugar do you need?

Answer: 9 cups (2/3 = 6/x, cross multiply: 2x = 18, x = 9)

4. Which ratios are equivalent to 4:6? (Check all that apply)

Answers: 2:3, 8:12, 12:18 (All simplify to 2:3 when reduced)

✏️ Part 2: Solving Proportions - ANSWERS

5. Solve for y: 7/y = 14/20

Work: Cross multiply: 7×20 = 14×y → 140 = 14y → y = 10

Answer: y = 10

6. In a classroom, the ratio of boys to girls is 3:5. If there are 15 girls, how many boys are there?

Proportion: 3/5 = x/15

Answer: 9 boys (Cross multiply: 3×15 = 45, 45÷5 = 9)

7. Complete the proportion: 12/16 = _____/4

Answer: 3 (12/16 = 3/4, so 3/4 = 3/4)

8. A car travels 240 miles in 4 hours. At this rate, how far will it travel in 7 hours?

Proportion: 240/4 = x/7

Work: Cross multiply: 240×7 = 4x → 1680 = 4x → x = 420

Answer: 420 miles

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