Question

what number must be added to each of the numbers 5 9 7 12 to get the numbers which are in proportion​

Answer 1

Answer:

3 must be added to each number to make them in proportion

Step-by-step explanation:

let x be added to each number to make them in proportion.

5+x / 9+x =7+x / 12+x

now cross multiplication,

(5+x) × (12+x) = (7+x) × (9+x)

60 + 17x + x^2 = 63 + 16x + x^2

further solving,

we get

63-60 = x

x = 3