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Finding the Fourth Proportional to 171.26, 236.22 and 129.68

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Solution

The fourth proportional to 171.26, 236.22 and 129.68 is: 178.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    171.26 : 236.22 = 129.68 : x
  2. Step 2: Convert to fraction form
    171.26/236.22 = 129.68/x
  3. Step 3: Cross multiply
    171.26x = 236.22 × 129.68
  4. Step 4: Simplify right side
    171.26x = 30,633.01
  5. Step 5: Solve for x
    x = 30,633.01/171.26
  6. Step 6: Final answer
    x = 178.87

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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.