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Finding the Fourth Proportional to 129.31, 192.89 and 115.64

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Solution

The fourth proportional to 129.31, 192.89 and 115.64 is: 172.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    129.31 : 192.89 = 115.64 : x
  2. Step 2: Convert to fraction form
    129.31/192.89 = 115.64/x
  3. Step 3: Cross multiply
    129.31x = 192.89 × 115.64
  4. Step 4: Simplify right side
    129.31x = 22,305.85
  5. Step 5: Solve for x
    x = 22,305.85/129.31
  6. Step 6: Final answer
    x = 172.50

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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.