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Finding the Fourth Proportional to 439.47, 658.99 and 131.21

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Solution

The fourth proportional to 439.47, 658.99 and 131.21 is: 196.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    439.47 : 658.99 = 131.21 : x
  2. Step 2: Convert to fraction form
    439.47/658.99 = 131.21/x
  3. Step 3: Cross multiply
    439.47x = 658.99 × 131.21
  4. Step 4: Simplify right side
    439.47x = 86,467.64
  5. Step 5: Solve for x
    x = 86,467.64/439.47
  6. Step 6: Final answer
    x = 196.76

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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.