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Finding the Fourth Proportional to 129.54, 194.49 and 71.97

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Solution

The fourth proportional to 129.54, 194.49 and 71.97 is: 108.06

Step by Step Solution

  1. Step 1: Write the proportion equation
    129.54 : 194.49 = 71.97 : x
  2. Step 2: Convert to fraction form
    129.54/194.49 = 71.97/x
  3. Step 3: Cross multiply
    129.54x = 194.49 × 71.97
  4. Step 4: Simplify right side
    129.54x = 13,997.45
  5. Step 5: Solve for x
    x = 13,997.45/129.54
  6. Step 6: Final answer
    x = 108.06

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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.