Finding the Fourth Proportional to 91.97, 126.92 and 77.14
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Solution
The fourth proportional to 91.97, 126.92 and 77.14 is: 106.45
Step by Step Solution
- Step 1: Write the proportion equation
91.97 : 126.92 = 77.14 : x - Step 2: Convert to fraction form
91.97/126.92 = 77.14/x - Step 3: Cross multiply
91.97x = 126.92 × 77.14 - Step 4: Simplify right side
91.97x = 9,789.81 - Step 5: Solve for x
x = 9,789.81/91.97 - Step 6: Final answer
x = 106.45
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Why These Related Problems?
These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.