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Finding the Fourth Proportional to 715,542.91, 987,472.89 and 393,264.43

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Solution

The fourth proportional to 715,542.91, 987,472.89 and 393,264.43 is: 542,717.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    715,542.91 : 987,472.89 = 393,264.43 : x
  2. Step 2: Convert to fraction form
    715,542.91/987,472.89 = 393,264.43/x
  3. Step 3: Cross multiply
    715,542.91x = 987,472.89 × 393,264.43
  4. Step 4: Simplify right side
    715,542.91x = 388,337,958,288.94
  5. Step 5: Solve for x
    x = 388,337,958,288.94/715,542.91
  6. Step 6: Final answer
    x = 542,717.92

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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.