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Finding the Fourth Proportional to 166.11, 249.17 and 74.79

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Solution

The fourth proportional to 166.11, 249.17 and 74.79 is: 112.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    166.11 : 249.17 = 74.79 : x
  2. Step 2: Convert to fraction form
    166.11/249.17 = 74.79/x
  3. Step 3: Cross multiply
    166.11x = 249.17 × 74.79
  4. Step 4: Simplify right side
    166.11x = 18,634.40
  5. Step 5: Solve for x
    x = 18,634.40/166.11
  6. Step 6: Final answer
    x = 112.18

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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.