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Finding the Fourth Proportional to 439.29, 658.80 and 131.16

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Solution

The fourth proportional to 439.29, 658.80 and 131.16 is: 196.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    439.29 : 658.80 = 131.16 : x
  2. Step 2: Convert to fraction form
    439.29/658.80 = 131.16/x
  3. Step 3: Cross multiply
    439.29x = 658.80 × 131.16
  4. Step 4: Simplify right side
    439.29x = 86,408.21
  5. Step 5: Solve for x
    x = 86,408.21/439.29
  6. Step 6: Final answer
    x = 196.70

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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.