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Finding the Fourth Proportional to 168.58, 252.72 and 81.86

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Solution

The fourth proportional to 168.58, 252.72 and 81.86 is: 122.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    168.58 : 252.72 = 81.86 : x
  2. Step 2: Convert to fraction form
    168.58/252.72 = 81.86/x
  3. Step 3: Cross multiply
    168.58x = 252.72 × 81.86
  4. Step 4: Simplify right side
    168.58x = 20,687.66
  5. Step 5: Solve for x
    x = 20,687.66/168.58
  6. Step 6: Final answer
    x = 122.72

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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.