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Finding the Fourth Proportional to 171.14, 235.98 and 129.56

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Solution

The fourth proportional to 171.14, 235.98 and 129.56 is: 178.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    171.14 : 235.98 = 129.56 : x
  2. Step 2: Convert to fraction form
    171.14/235.98 = 129.56/x
  3. Step 3: Cross multiply
    171.14x = 235.98 × 129.56
  4. Step 4: Simplify right side
    171.14x = 30,572.39
  5. Step 5: Solve for x
    x = 30,572.39/171.14
  6. Step 6: Final answer
    x = 178.64

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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.