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Finding the Fourth Proportional to 171.12, 235.80 and 129.68

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Solution

The fourth proportional to 171.12, 235.80 and 129.68 is: 178.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    171.12 : 235.80 = 129.68 : x
  2. Step 2: Convert to fraction form
    171.12/235.80 = 129.68/x
  3. Step 3: Cross multiply
    171.12x = 235.80 × 129.68
  4. Step 4: Simplify right side
    171.12x = 30,578.54
  5. Step 5: Solve for x
    x = 30,578.54/171.12
  6. Step 6: Final answer
    x = 178.70

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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.