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Finding the Fourth Proportional to 252.87, 379.17 and 129.45

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Solution

The fourth proportional to 252.87, 379.17 and 129.45 is: 194.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    252.87 : 379.17 = 129.45 : x
  2. Step 2: Convert to fraction form
    252.87/379.17 = 129.45/x
  3. Step 3: Cross multiply
    252.87x = 379.17 × 129.45
  4. Step 4: Simplify right side
    252.87x = 49,083.80
  5. Step 5: Solve for x
    x = 49,083.80/252.87
  6. Step 6: Final answer
    x = 194.11

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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.