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Finding the Fourth Proportional to 168.34, 252.54 and 81.65

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Solution

The fourth proportional to 168.34, 252.54 and 81.65 is: 122.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    168.34 : 252.54 = 81.65 : x
  2. Step 2: Convert to fraction form
    168.34/252.54 = 81.65/x
  3. Step 3: Cross multiply
    168.34x = 252.54 × 81.65
  4. Step 4: Simplify right side
    168.34x = 20,619.89
  5. Step 5: Solve for x
    x = 20,619.89/168.34
  6. Step 6: Final answer
    x = 122.49

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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.