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Finding the Fourth Proportional to 168.72, 232.38 and 129.42

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Solution

The fourth proportional to 168.72, 232.38 and 129.42 is: 178.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    168.72 : 232.38 = 129.42 : x
  2. Step 2: Convert to fraction form
    168.72/232.38 = 129.42/x
  3. Step 3: Cross multiply
    168.72x = 232.38 × 129.42
  4. Step 4: Simplify right side
    168.72x = 30,074.62
  5. Step 5: Solve for x
    x = 30,074.62/168.72
  6. Step 6: Final answer
    x = 178.25

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.