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Finding the Fourth Proportional to 439.10, 658.39 and 165.21

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Solution

The fourth proportional to 439.10, 658.39 and 165.21 is: 247.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    439.10 : 658.39 = 165.21 : x
  2. Step 2: Convert to fraction form
    439.10/658.39 = 165.21/x
  3. Step 3: Cross multiply
    439.10x = 658.39 × 165.21
  4. Step 4: Simplify right side
    439.10x = 108,772.41
  5. Step 5: Solve for x
    x = 108,772.41/439.10
  6. Step 6: Final answer
    x = 247.72

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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.