Question

What same number should be added to each of the numbox 2, 7, 10 and 25 so that they form a proportion?​

Answer 1

Step-by-step explanation:

Let c be the required number so that 2+c, 7+c, 10+c, and 25+c are in proportion.

then (2+c)(25+c)=(7+c)10+c)

50+27c+c^2=70+17c+c^2

10c=20

c=2

So the required number is 2 and the given numbers becomes 4,9,12,27.