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Finding the Fourth Proportional to 715,137.66, 986,841.23 and 392,861.34

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Solution

The fourth proportional to 715,137.66, 986,841.23 and 392,861.34 is: 542,121.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    715,137.66 : 986,841.23 = 392,861.34 : x
  2. Step 2: Convert to fraction form
    715,137.66/986,841.23 = 392,861.34/x
  3. Step 3: Cross multiply
    715,137.66x = 986,841.23 × 392,861.34
  4. Step 4: Simplify right side
    715,137.66x = 387,691,766,020.74
  5. Step 5: Solve for x
    x = 387,691,766,020.74/715,137.66
  6. Step 6: Final answer
    x = 542,121.87

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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.