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Finding the Fourth Proportional to 166.41, 249.60 and 85.20

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Solution

The fourth proportional to 166.41, 249.60 and 85.20 is: 127.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    166.41 : 249.60 = 85.20 : x
  2. Step 2: Convert to fraction form
    166.41/249.60 = 85.20/x
  3. Step 3: Cross multiply
    166.41x = 249.60 × 85.20
  4. Step 4: Simplify right side
    166.41x = 21,265.92
  5. Step 5: Solve for x
    x = 21,265.92/166.41
  6. Step 6: Final answer
    x = 127.79

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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.