Question

The third proportional to 15 and 20 is​

Answer 1

Answer:

The third proportional to 15 and 20 is 26$\frac{2}{3}$ or 26.67 (approx)

Step-by-step explanation:

Let a and b be the first two proportionals. We need the third proportional "c" so that a:b::b:c

=> a/b = b/c

=> ac = b^2

=> c = b^2/a

In our case, a = 15, b = 20

=> c = (20)^2/15

       = 400/15

      = 26$\frac{2}{3}$

The third proportional is 26$\frac{2}{3}$