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Finding the Fourth Proportional to 439.39, 658.96 and 131.16

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Solution

The fourth proportional to 439.39, 658.96 and 131.16 is: 196.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    439.39 : 658.96 = 131.16 : x
  2. Step 2: Convert to fraction form
    439.39/658.96 = 131.16/x
  3. Step 3: Cross multiply
    439.39x = 658.96 × 131.16
  4. Step 4: Simplify right side
    439.39x = 86,429.19
  5. Step 5: Solve for x
    x = 86,429.19/439.39
  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.