Question

Find the fourth proportional to 6.9, 20.

Answer 1

Answer :- thus the x=30 6:9::20:30

Answer 2

Answer:

Given:

The numbers are 3.6, 6.9, and 11.4.

Concept used:

For finding the fourth proportional of a, b and c.

a/b = c/d

Where d is the fourth proportional.

d = c × b/a

Calculation:

Let the fourth proportional to 3.6, 6.9 and 11.4 be x

⇒ 3.6/6.9 = 11.4/x

⇒ x = 11.4 × 6.9/3.6

∴ x = 21.85

∴ The fourth proportional of the given numbers is 21.85.

Step-by-step explanation:

hope it helps