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Finding the Fourth Proportional to 168.10, 251.98 and 81.30

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Solution

The fourth proportional to 168.10, 251.98 and 81.30 is: 121.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    168.10 : 251.98 = 81.30 : x
  2. Step 2: Convert to fraction form
    168.10/251.98 = 81.30/x
  3. Step 3: Cross multiply
    168.10x = 251.98 × 81.30
  4. Step 4: Simplify right side
    168.10x = 20,485.77
  5. Step 5: Solve for x
    x = 20,485.77/168.10
  6. Step 6: Final answer
    x = 121.87

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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.