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Finding the Fourth Proportional to 129.96, 194.81 and 81.22

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Solution

The fourth proportional to 129.96, 194.81 and 81.22 is: 121.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    129.96 : 194.81 = 81.22 : x
  2. Step 2: Convert to fraction form
    129.96/194.81 = 81.22/x
  3. Step 3: Cross multiply
    129.96x = 194.81 × 81.22
  4. Step 4: Simplify right side
    129.96x = 15,822.63
  5. Step 5: Solve for x
    x = 15,822.63/129.96
  6. Step 6: Final answer
    x = 121.75

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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.