What number must be added to each of the numbers 10,18,22,38 to make them in proportion?
The correct option is C (2)
Given numbers: 10,18,22,38
Let the number be x.
⇒10+x:18+x=22+x:38+x
⇒(10+x)(38+x)=(18+x)(22+x)
380+10x+38x+x2=396+18x+22x+x2
48x−40x=396−380
8x=16
∴x=2