What is the fourth proportional of 3, 9 and 7?
- 11
- 21
- 19
- None of these
Explanation
To find the fourth proportional, let's denote it as x. The proportion will be:
3 : 9 = 7 : x
We can cross-multiply:
3x = 9 × 7
3x = 63
x = 63 / 3
x = 21
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