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Finding the Fourth Proportional to 439.31, 658.82 and 131.15

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Solution

The fourth proportional to 439.31, 658.82 and 131.15 is: 196.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    439.31 : 658.82 = 131.15 : x
  2. Step 2: Convert to fraction form
    439.31/658.82 = 131.15/x
  3. Step 3: Cross multiply
    439.31x = 658.82 × 131.15
  4. Step 4: Simplify right side
    439.31x = 86,400.29
  5. Step 5: Solve for x
    x = 86,400.29/439.31
  6. Step 6: Final answer
    x = 196.67

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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.