Finding the Fourth Proportional to 87,139.20, 129,723.36 and 86,620.80
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Solution
The fourth proportional to 87,139.20, 129,723.36 and 86,620.80 is: 128,951.62
Step by Step Solution
- Step 1: Write the proportion equation
87,139.20 : 129,723.36 = 86,620.80 : x - Step 2: Convert to fraction form
87,139.20/129,723.36 = 86,620.80/x - Step 3: Cross multiply
87,139.20x = 129,723.36 × 86,620.80 - Step 4: Simplify right side
87,139.20x = 11,236,741,221.89 - Step 5: Solve for x
x = 11,236,741,221.89/87,139.20 - Step 6: Final answer
x = 128,951.62
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Why These Related Problems?
These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.