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Finding the Fourth Proportional to 439.24, 658.86 and 131.11

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Solution

The fourth proportional to 439.24, 658.86 and 131.11 is: 196.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    439.24 : 658.86 = 131.11 : x
  2. Step 2: Convert to fraction form
    439.24/658.86 = 131.11/x
  3. Step 3: Cross multiply
    439.24x = 658.86 × 131.11
  4. Step 4: Simplify right side
    439.24x = 86,379.84
  5. Step 5: Solve for x
    x = 86,379.84/439.24
  6. Step 6: Final answer
    x = 196.66

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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.