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Finding the Fourth Proportional to 715,542.90, 987,472.88 and 393,264.42

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Solution

The fourth proportional to 715,542.90, 987,472.88 and 393,264.42 is: 542,717.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    715,542.90 : 987,472.88 = 393,264.42 : x
  2. Step 2: Convert to fraction form
    715,542.90/987,472.88 = 393,264.42/x
  3. Step 3: Cross multiply
    715,542.90x = 987,472.88 × 393,264.42
  4. Step 4: Simplify right side
    715,542.90x = 388,337,949,418.93
  5. Step 5: Solve for x
    x = 388,337,949,418.93/715,542.90
  6. Step 6: Final answer
    x = 542,717.91

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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.