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Finding the Fourth Proportional to 477.57, 658.50 and 311.55

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Solution

The fourth proportional to 477.57, 658.50 and 311.55 is: 429.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    477.57 : 658.50 = 311.55 : x
  2. Step 2: Convert to fraction form
    477.57/658.50 = 311.55/x
  3. Step 3: Cross multiply
    477.57x = 658.50 × 311.55
  4. Step 4: Simplify right side
    477.57x = 205,155.68
  5. Step 5: Solve for x
    x = 205,155.68/477.57
  6. Step 6: Final answer
    x = 429.58

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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.