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Finding the Fourth Proportional to 625.69, 863.31 and 392.86

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Solution

The fourth proportional to 625.69, 863.31 and 392.86 is: 542.06

Step by Step Solution

  1. Step 1: Write the proportion equation
    625.69 : 863.31 = 392.86 : x
  2. Step 2: Convert to fraction form
    625.69/863.31 = 392.86/x
  3. Step 3: Cross multiply
    625.69x = 863.31 × 392.86
  4. Step 4: Simplify right side
    625.69x = 339,159.97
  5. Step 5: Solve for x
    x = 339,159.97/625.69
  6. Step 6: Final answer
    x = 542.06

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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.