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Finding the Fourth Proportional to 166.80, 250.20 and 109.20

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Solution

The fourth proportional to 166.80, 250.20 and 109.20 is: 163.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    166.80 : 250.20 = 109.20 : x
  2. Step 2: Convert to fraction form
    166.80/250.20 = 109.20/x
  3. Step 3: Cross multiply
    166.80x = 250.20 × 109.20
  4. Step 4: Simplify right side
    166.80x = 27,321.84
  5. Step 5: Solve for x
    x = 27,321.84/166.80
  6. Step 6: Final answer
    x = 163.80

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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.