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Finding the Fourth Proportional to 129.40, 193.09 and 115.73

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Solution

The fourth proportional to 129.40, 193.09 and 115.73 is: 172.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    129.40 : 193.09 = 115.73 : x
  2. Step 2: Convert to fraction form
    129.40/193.09 = 115.73/x
  3. Step 3: Cross multiply
    129.40x = 193.09 × 115.73
  4. Step 4: Simplify right side
    129.40x = 22,346.31
  5. Step 5: Solve for x
    x = 22,346.31/129.40
  6. Step 6: Final answer
    x = 172.69

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.