Question

find the forth proportional to 6,8and 9?

Answer 1

let fourth proportion be x

6: 8:: 9: x

$6 \times x = 8 \times 9 \\ x = \frac{8 \times 9}{6} \\ x = 12$

Answer 2

Step-by-step explanation:

If a:b :: c:d or in other words a:b = c: d, then the quantity 'd' is what we call the fourth proportional to a, b and c. For example, if we have 2, 3 and 4, 5 are in the proportion such that 2 and 5 are the extremes, then 5 is the fourth proportional to 2, 3, and 4.