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Finding the Fourth Proportional to 658.41, 908.91 and 396.38

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Solution

The fourth proportional to 658.41, 908.91 and 396.38 is: 547.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    658.41 : 908.91 = 396.38 : x
  2. Step 2: Convert to fraction form
    658.41/908.91 = 396.38/x
  3. Step 3: Cross multiply
    658.41x = 908.91 × 396.38
  4. Step 4: Simplify right side
    658.41x = 360,269.20
  5. Step 5: Solve for x
    x = 360,269.20/658.41
  6. Step 6: Final answer
    x = 547.18

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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.