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Finding the Fourth Proportional to 625.22, 862.40 and 477.60

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Solution

The fourth proportional to 625.22, 862.40 and 477.60 is: 658.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    625.22 : 862.40 = 477.60 : x
  2. Step 2: Convert to fraction form
    625.22/862.40 = 477.60/x
  3. Step 3: Cross multiply
    625.22x = 862.40 × 477.60
  4. Step 4: Simplify right side
    625.22x = 411,882.24
  5. Step 5: Solve for x
    x = 411,882.24/625.22
  6. Step 6: Final answer
    x = 658.78

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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.