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Finding the Fourth Proportional to 168.39, 252.34 and 76.86

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Solution

The fourth proportional to 168.39, 252.34 and 76.86 is: 115.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    168.39 : 252.34 = 76.86 : x
  2. Step 2: Convert to fraction form
    168.39/252.34 = 76.86/x
  3. Step 3: Cross multiply
    168.39x = 252.34 × 76.86
  4. Step 4: Simplify right side
    168.39x = 19,394.85
  5. Step 5: Solve for x
    x = 19,394.85/168.39
  6. Step 6: Final answer
    x = 115.18

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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.