# Calculate the 3rd Proportional to 15 and 30.

**Answer: (4) 60**

**Explanation:-**

Let be the third proportion is X

Then, 15 : 30 :: 30 : X

Or,

15/30 = 30/X

X = 30 x 30/15

X = 60

Hence, the third proportion is 60.

**Answer: (4) 60**

**Explanation:-**

Let be the third proportion is X

Then, 15 : 30 :: 30 : X

Or,

15/30 = 30/X

X = 30 x 30/15

X = 60

Hence, the third proportion is 60.