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Finding the Fourth Proportional to 166.88, 250.09 and 85.55

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Solution

The fourth proportional to 166.88, 250.09 and 85.55 is: 128.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    166.88 : 250.09 = 85.55 : x
  2. Step 2: Convert to fraction form
    166.88/250.09 = 85.55/x
  3. Step 3: Cross multiply
    166.88x = 250.09 × 85.55
  4. Step 4: Simplify right side
    166.88x = 21,395.20
  5. Step 5: Solve for x
    x = 21,395.20/166.88
  6. Step 6: Final answer
    x = 128.21

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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.