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Finding the Fourth Proportional to 439.28, 658.93 and 256.58

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Solution

The fourth proportional to 439.28, 658.93 and 256.58 is: 384.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    439.28 : 658.93 = 256.58 : x
  2. Step 2: Convert to fraction form
    439.28/658.93 = 256.58/x
  3. Step 3: Cross multiply
    439.28x = 658.93 × 256.58
  4. Step 4: Simplify right side
    439.28x = 169,068.26
  5. Step 5: Solve for x
    x = 169,068.26/439.28
  6. Step 6: Final answer
    x = 384.88

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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.