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Finding the Fourth Proportional to 617.40, 925.76 and 422.62

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Solution

The fourth proportional to 617.40, 925.76 and 422.62 is: 633.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    617.40 : 925.76 = 422.62 : x
  2. Step 2: Convert to fraction form
    617.40/925.76 = 422.62/x
  3. Step 3: Cross multiply
    617.40x = 925.76 × 422.62
  4. Step 4: Simplify right side
    617.40x = 391,242.58
  5. Step 5: Solve for x
    x = 391,242.58/617.40
  6. Step 6: Final answer
    x = 633.70

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.