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Finding the Fourth Proportional to 168.20, 252.26 and 81.46

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Solution

The fourth proportional to 168.20, 252.26 and 81.46 is: 122.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    168.20 : 252.26 = 81.46 : x
  2. Step 2: Convert to fraction form
    168.20/252.26 = 81.46/x
  3. Step 3: Cross multiply
    168.20x = 252.26 × 81.46
  4. Step 4: Simplify right side
    168.20x = 20,549.10
  5. Step 5: Solve for x
    x = 20,549.10/168.20
  6. Step 6: Final answer
    x = 122.17

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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.