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Finding the Fourth Proportional to 166.25, 249.28 and 83.90

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Solution

The fourth proportional to 166.25, 249.28 and 83.90 is: 125.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    166.25 : 249.28 = 83.90 : x
  2. Step 2: Convert to fraction form
    166.25/249.28 = 83.90/x
  3. Step 3: Cross multiply
    166.25x = 249.28 × 83.90
  4. Step 4: Simplify right side
    166.25x = 20,914.59
  5. Step 5: Solve for x
    x = 20,914.59/166.25
  6. Step 6: Final answer
    x = 125.80

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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.