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Finding the Fourth Proportional to 168.82, 252.89 and 77.39

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Solution

The fourth proportional to 168.82, 252.89 and 77.39 is: 115.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    168.82 : 252.89 = 77.39 : x
  2. Step 2: Convert to fraction form
    168.82/252.89 = 77.39/x
  3. Step 3: Cross multiply
    168.82x = 252.89 × 77.39
  4. Step 4: Simplify right side
    168.82x = 19,569.51
  5. Step 5: Solve for x
    x = 19,569.51/168.82
  6. Step 6: Final answer
    x = 115.92

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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.