What is the fourth proportional of \(\frac{1}{72},\frac{1}{168},\frac{1}{150}\) ?
The correct answer is \frac{1}{350}.
We know that 25200 = 252 \times 100. Also, 72 \times 3.5 = 252, or 72 \times 350 = 25200. \[ d = \frac{72}{72 \times 350} = \frac{1}{350} \] This confirms our previous calculation using the direct proportion equation method. Both methods yield the same fourth proportional, \frac{1}{350}.
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