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Finding the Fourth Proportional to 715,072.80, 986,796.92 and 392,781.92

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Solution

The fourth proportional to 715,072.80, 986,796.92 and 392,781.92 is: 542,037.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    715,072.80 : 986,796.92 = 392,781.92 : x
  2. Step 2: Convert to fraction form
    715,072.80/986,796.92 = 392,781.92/x
  3. Step 3: Cross multiply
    715,072.80x = 986,796.92 × 392,781.92
  4. Step 4: Simplify right side
    715,072.80x = 387,595,988,887.69
  5. Step 5: Solve for x
    x = 387,595,988,887.69/715,072.80
  6. Step 6: Final answer
    x = 542,037.10

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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.