Practice solving ratio and proportion problems in math

**Quick Math Guide**

*∷ In a proportion, the product of extremes = product of means*

*∷ (First term) x (Fourth term) = (Second term) x (Third term)*

**Practice Worksheet**

1. The ratio of boys and girls in a camp is 9:8. If the number of boys is 18. Find the number of girls.

2. The ratio of apples to oranges in a box is 2:11. Find the number of apples if the number of oranges is 121.

3. Find the fourth proportional of 5, 9 and 45.

4. Find the mean proportional between 4 and 9.

5. Find the fourth proportional of 3, 6 and 18.

2. The ratio of apples to oranges in a box is 2:11. Find the number of apples if the number of oranges is 121.

3. Find the fourth proportional of 5, 9 and 45.

4. Find the mean proportional between 4 and 9.

5. Find the fourth proportional of 3, 6 and 18.

Answers:

1. 16

2. 22

3. 81

4. 6

5. 36