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Finding the Fourth Proportional to 129.35, 194.02 and 81.29

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Solution

The fourth proportional to 129.35, 194.02 and 81.29 is: 121.93

Step by Step Solution

  1. Step 1: Write the proportion equation
    129.35 : 194.02 = 81.29 : x
  2. Step 2: Convert to fraction form
    129.35/194.02 = 81.29/x
  3. Step 3: Cross multiply
    129.35x = 194.02 × 81.29
  4. Step 4: Simplify right side
    129.35x = 15,770.51
  5. Step 5: Solve for x
    x = 15,770.51/129.35
  6. Step 6: Final answer
    x = 121.93

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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.