Finding the Fourth Proportional to 90,691.26, 125,115.09 and 56,640.63
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Solution
The fourth proportional to 90,691.26, 125,115.09 and 56,640.63 is: 78,139.81
Step by Step Solution
- Step 1: Write the proportion equation
90,691.26 : 125,115.09 = 56,640.63 : x - Step 2: Convert to fraction form
90,691.26/125,115.09 = 56,640.63/x - Step 3: Cross multiply
90,691.26x = 125,115.09 × 56,640.63 - Step 4: Simplify right side
90,691.26x = 7,086,597,520.11 - Step 5: Solve for x
x = 7,086,597,520.11/90,691.26 - Step 6: Final answer
x = 78,139.81
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1.5x scale
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.