what denominator for 21/3 = 49/? would make these ratios proportional?

1 answer

In order for the ratios to be proportional, the denominators on both sides of the equation must be equal.

Given that the original ratio is 21/3 = 49/?, to find the missing denominator that would make the ratios proportional, we need to cross-multiply:

21 * ? = 3 * 49

? = (3 * 49) / 21

To simplify the expression, we can divide both 3 and 49 by their greatest common divisor, which is 1.

? = (3/21) * 49

? = (1/7) * 49

? = 7

Therefore, a denominator of 7 on the right side would make the ratios proportional.