If 12 : x : : 15 : 25, then the value of x is

1. 10
2. 15
3. 18
4. 20

Given:

Proportion: 12 : x : : 15 : 25

Product of Means = Product of Extremes

x × 15 = 12 × 25

15x = 300

⇒ x = $\dfrac{300}{15}$

⇒ x = 20

Hence, option 4 is the correct option.