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Finding the Fourth Proportional to 171.29, 236.70 and 129.78

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Solution

The fourth proportional to 171.29, 236.70 and 129.78 is: 179.33

Step by Step Solution

  1. Step 1: Write the proportion equation
    171.29 : 236.70 = 129.78 : x
  2. Step 2: Convert to fraction form
    171.29/236.70 = 129.78/x
  3. Step 3: Cross multiply
    171.29x = 236.70 × 129.78
  4. Step 4: Simplify right side
    171.29x = 30,717.09
  5. Step 5: Solve for x
    x = 30,717.09/171.29
  6. Step 6: Final answer
    x = 179.33

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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.