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Finding the Fourth Proportional to 168.48, 252.90 and 81.96

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Solution

The fourth proportional to 168.48, 252.90 and 81.96 is: 123.03

Step by Step Solution

  1. Step 1: Write the proportion equation
    168.48 : 252.90 = 81.96 : x
  2. Step 2: Convert to fraction form
    168.48/252.90 = 81.96/x
  3. Step 3: Cross multiply
    168.48x = 252.90 × 81.96
  4. Step 4: Simplify right side
    168.48x = 20,727.68
  5. Step 5: Solve for x
    x = 20,727.68/168.48
  6. Step 6: Final answer
    x = 123.03

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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.