Question

3:8: :6: x

Find the value of x. in the following. proportion
3: 5: : x:25
X :12 : : 6 : 18

Answer 1

$5 \times x = 3 \times 25 \\ x = 3 \times 25 \div 5 \\ x = 3 \times 5x \\ x = 15$

Answer 2

(1)
▶3/8 = 6x

▶x = 4

(2)

3/5 :: x : 25

▶ 3*25 = 5x

▶x = 15

(3)

➡x/12 :: 6/18

▶ 18x = 6*
$x = \frac{6 \times 12}{18}$

▶x =2

Hope it helps.'-)