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Finding the Fourth Proportional to 439.46, 658.09 and 256.30

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Solution

The fourth proportional to 439.46, 658.09 and 256.30 is: 383.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    439.46 : 658.09 = 256.30 : x
  2. Step 2: Convert to fraction form
    439.46/658.09 = 256.30/x
  3. Step 3: Cross multiply
    439.46x = 658.09 × 256.30
  4. Step 4: Simplify right side
    439.46x = 168,667.14
  5. Step 5: Solve for x
    x = 168,667.14/439.46
  6. Step 6: Final answer
    x = 383.81

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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.