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Finding the Fourth Proportional to 168.11, 252.25 and 86.91

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Solution

The fourth proportional to 168.11, 252.25 and 86.91 is: 130.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    168.11 : 252.25 = 86.91 : x
  2. Step 2: Convert to fraction form
    168.11/252.25 = 86.91/x
  3. Step 3: Cross multiply
    168.11x = 252.25 × 86.91
  4. Step 4: Simplify right side
    168.11x = 21,921.88
  5. Step 5: Solve for x
    x = 21,921.88/168.11
  6. Step 6: Final answer
    x = 130.40

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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.