What is the fourth proportional of 3, 7 and 15?
- 35
- 39
- 36
- None of these
Explanation
To find the fourth proportional of 3, 7, and 15:
Let's denote the fourth proportional as x. We set up the proportion:
3/7 = 15/x
Step 1: Cross-multiply.
3x = 7 × 15
Step 2: Calculate the product of 7 and 15.
3x = 105
Step 3: Solve for x.
x = 105 / 3
x = 35
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