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Finding the Fourth Proportional to 168.05, 252.09 and 86.87

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Solution

The fourth proportional to 168.05, 252.09 and 86.87 is: 130.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    168.05 : 252.09 = 86.87 : x
  2. Step 2: Convert to fraction form
    168.05/252.09 = 86.87/x
  3. Step 3: Cross multiply
    168.05x = 252.09 × 86.87
  4. Step 4: Simplify right side
    168.05x = 21,898.62
  5. Step 5: Solve for x
    x = 21,898.62/168.05
  6. Step 6: Final answer
    x = 130.31

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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.