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Finding the Fourth Proportional to 220.92, 331.28 and 129.65

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Solution

The fourth proportional to 220.92, 331.28 and 129.65 is: 194.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    220.92 : 331.28 = 129.65 : x
  2. Step 2: Convert to fraction form
    220.92/331.28 = 129.65/x
  3. Step 3: Cross multiply
    220.92x = 331.28 × 129.65
  4. Step 4: Simplify right side
    220.92x = 42,948.15
  5. Step 5: Solve for x
    x = 42,948.15/220.92
  6. Step 6: Final answer
    x = 194.41

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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.