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Finding the Fourth Proportional to 625.92, 862.56 and 520.80

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Solution

The fourth proportional to 625.92, 862.56 and 520.80 is: 717.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    625.92 : 862.56 = 520.80 : x
  2. Step 2: Convert to fraction form
    625.92/862.56 = 520.80/x
  3. Step 3: Cross multiply
    625.92x = 862.56 × 520.80
  4. Step 4: Simplify right side
    625.92x = 449,221.25
  5. Step 5: Solve for x
    x = 449,221.25/625.92
  6. Step 6: Final answer
    x = 717.70

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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.