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Finding the Fourth Proportional to 129.73, 194.55 and 81.07

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Solution

The fourth proportional to 129.73, 194.55 and 81.07 is: 121.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    129.73 : 194.55 = 81.07 : x
  2. Step 2: Convert to fraction form
    129.73/194.55 = 81.07/x
  3. Step 3: Cross multiply
    129.73x = 194.55 × 81.07
  4. Step 4: Simplify right side
    129.73x = 15,772.17
  5. Step 5: Solve for x
    x = 15,772.17/129.73
  6. Step 6: Final answer
    x = 121.58

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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.