Question

Find the fourth proportional of 3,12 and 4

Answer 1

Let x be the fourth proportional

12

3

=

x

4

⇒

4×3

3

=

x

4

⇒

4

1

=

x

4

⇒x=4×4=16

⟹x=4

⇒3,12 & 4,16 are in proportion.

Answer 2

Answer:

Let x be the fourth proportional