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Finding the Fourth Proportional to 715,540.91, 987,470.12 and 393,262.43

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Solution

The fourth proportional to 715,540.91, 987,470.12 and 393,262.43 is: 542,715.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    715,540.91 : 987,470.12 = 393,262.43 : x
  2. Step 2: Convert to fraction form
    715,540.91/987,470.12 = 393,262.43/x
  3. Step 3: Cross multiply
    715,540.91x = 987,470.12 × 393,262.43
  4. Step 4: Simplify right side
    715,540.91x = 388,334,894,989.40
  5. Step 5: Solve for x
    x = 388,334,894,989.40/715,540.91
  6. Step 6: Final answer
    x = 542,715.16

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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.