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Finding the Fourth Proportional to 439.27, 658.70 and 256.72

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Solution

The fourth proportional to 439.27, 658.70 and 256.72 is: 384.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    439.27 : 658.70 = 256.72 : x
  2. Step 2: Convert to fraction form
    439.27/658.70 = 256.72/x
  3. Step 3: Cross multiply
    439.27x = 658.70 × 256.72
  4. Step 4: Simplify right side
    439.27x = 169,101.46
  5. Step 5: Solve for x
    x = 169,101.46/439.27
  6. Step 6: Final answer
    x = 384.96

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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.