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Finding the Fourth Proportional to 168.16, 252.30 and 76.86

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Solution

The fourth proportional to 168.16, 252.30 and 76.86 is: 115.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    168.16 : 252.30 = 76.86 : x
  2. Step 2: Convert to fraction form
    168.16/252.30 = 76.86/x
  3. Step 3: Cross multiply
    168.16x = 252.30 × 76.86
  4. Step 4: Simplify right side
    168.16x = 19,391.78
  5. Step 5: Solve for x
    x = 19,391.78/168.16
  6. Step 6: Final answer
    x = 115.32

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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.