Question

first,second and fourth terms of a proportion are respectively 5.2,3.9and3. find its third term

Answer 1

Let the 4th term be x.
5.2:3.9 :: x:3
5.2×3=3.9×x
x=15.6/3.9
x=4

Hope it helps:)

Answer 2

Answer:

Let the 4th term be x.

5.2:3.9: x:3

5.2*3=3.9xx

x=15.6/3.9

x=4