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Finding the Fourth Proportional to 168.46, 252.61 and 77.11

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Solution

The fourth proportional to 168.46, 252.61 and 77.11 is: 115.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    168.46 : 252.61 = 77.11 : x
  2. Step 2: Convert to fraction form
    168.46/252.61 = 77.11/x
  3. Step 3: Cross multiply
    168.46x = 252.61 × 77.11
  4. Step 4: Simplify right side
    168.46x = 19,477.93
  5. Step 5: Solve for x
    x = 19,477.93/168.46
  6. Step 6: Final answer
    x = 115.63

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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.