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Finding the Fourth Proportional to 168.64, 252.81 and 81.93

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Solution

The fourth proportional to 168.64, 252.81 and 81.93 is: 122.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    168.64 : 252.81 = 81.93 : x
  2. Step 2: Convert to fraction form
    168.64/252.81 = 81.93/x
  3. Step 3: Cross multiply
    168.64x = 252.81 × 81.93
  4. Step 4: Simplify right side
    168.64x = 20,712.72
  5. Step 5: Solve for x
    x = 20,712.72/168.64
  6. Step 6: Final answer
    x = 122.82

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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.