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Finding the Fourth Proportional to 658.20, 908.40 and 422.16

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Solution

The fourth proportional to 658.20, 908.40 and 422.16 is: 582.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    658.20 : 908.40 = 422.16 : x
  2. Step 2: Convert to fraction form
    658.20/908.40 = 422.16/x
  3. Step 3: Cross multiply
    658.20x = 908.40 × 422.16
  4. Step 4: Simplify right side
    658.20x = 383,490.14
  5. Step 5: Solve for x
    x = 383,490.14/658.20
  6. Step 6: Final answer
    x = 582.63

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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.