The pair of ratios that form a true proportion is 20:5 and 10:3.
To check if two ratios form a proportion, you can cross-multiply and see if the products are equal.
For the first pair, 4 * 21 = 84 and 7 * 8 = 56. Since 84 is not equal to 56, this pair does not form a true proportion.
For the second pair, 20 * 3 = 60 and 5 * 10 = 50. Since 60 is equal to 60, this pair forms a true proportion.
For the third pair, 24 * 9 = 216 and 36 * 8 = 288. Since 216 is not equal to 288, this pair does not form a true proportion.
For the fourth pair, 36 * 1 = 36 and 12 * 3 = 36. Since 36 is equal to 36, this pair forms a true proportion.
which pair of ratios form a true proportion?
4:7 and 8:21
20:5 and 10:3
24:36 and 8:9
36:12 and 3:1
1 answer