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Finding the Fourth Proportional to 168.25, 252.38 and 76.89

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Solution

The fourth proportional to 168.25, 252.38 and 76.89 is: 115.33

Step by Step Solution

  1. Step 1: Write the proportion equation
    168.25 : 252.38 = 76.89 : x
  2. Step 2: Convert to fraction form
    168.25/252.38 = 76.89/x
  3. Step 3: Cross multiply
    168.25x = 252.38 × 76.89
  4. Step 4: Simplify right side
    168.25x = 19,404.72
  5. Step 5: Solve for x
    x = 19,404.72/168.25
  6. Step 6: Final answer
    x = 115.33

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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.