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Finding the Fourth Proportional to 166.89, 250.41 and 81.39

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Solution

The fourth proportional to 166.89, 250.41 and 81.39 is: 122.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    166.89 : 250.41 = 81.39 : x
  2. Step 2: Convert to fraction form
    166.89/250.41 = 81.39/x
  3. Step 3: Cross multiply
    166.89x = 250.41 × 81.39
  4. Step 4: Simplify right side
    166.89x = 20,380.87
  5. Step 5: Solve for x
    x = 20,380.87/166.89
  6. Step 6: Final answer
    x = 122.12

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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.