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Finding the Fourth Proportional to 171.38, 236.61 and 129.86

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Solution

The fourth proportional to 171.38, 236.61 and 129.86 is: 179.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    171.38 : 236.61 = 129.86 : x
  2. Step 2: Convert to fraction form
    171.38/236.61 = 129.86/x
  3. Step 3: Cross multiply
    171.38x = 236.61 × 129.86
  4. Step 4: Simplify right side
    171.38x = 30,726.17
  5. Step 5: Solve for x
    x = 30,726.17/171.38
  6. Step 6: Final answer
    x = 179.29

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.