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Finding the Fourth Proportional to 129.92, 194.88 and 81.92

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Solution

The fourth proportional to 129.92, 194.88 and 81.92 is: 122.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    129.92 : 194.88 = 81.92 : x
  2. Step 2: Convert to fraction form
    129.92/194.88 = 81.92/x
  3. Step 3: Cross multiply
    129.92x = 194.88 × 81.92
  4. Step 4: Simplify right side
    129.92x = 15,964.57
  5. Step 5: Solve for x
    x = 15,964.57/129.92
  6. Step 6: Final answer
    x = 122.88

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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.