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Finding the Fourth Proportional to 477.39, 658.81 and 280.90

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Solution

The fourth proportional to 477.39, 658.81 and 280.90 is: 387.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    477.39 : 658.81 = 280.90 : x
  2. Step 2: Convert to fraction form
    477.39/658.81 = 280.90/x
  3. Step 3: Cross multiply
    477.39x = 658.81 × 280.90
  4. Step 4: Simplify right side
    477.39x = 185,059.73
  5. Step 5: Solve for x
    x = 185,059.73/477.39
  6. Step 6: Final answer
    x = 387.65

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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.