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Finding the Fourth Proportional to 625, 863.04 and 391.72

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Solution

The fourth proportional to 625, 863.04 and 391.72 is: 540.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    625 : 863.04 = 391.72 : x
  2. Step 2: Convert to fraction form
    625/863.04 = 391.72/x
  3. Step 3: Cross multiply
    625x = 863.04 × 391.72
  4. Step 4: Simplify right side
    625x = 338,070.03
  5. Step 5: Solve for x
    x = 338,070.03/625
  6. Step 6: Final answer
    x = 540.91

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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.