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Finding the Fourth Proportional to 180.87, 271.40 and 129.66

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Solution

The fourth proportional to 180.87, 271.40 and 129.66 is: 194.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    180.87 : 271.40 = 129.66 : x
  2. Step 2: Convert to fraction form
    180.87/271.40 = 129.66/x
  3. Step 3: Cross multiply
    180.87x = 271.40 × 129.66
  4. Step 4: Simplify right side
    180.87x = 35,189.72
  5. Step 5: Solve for x
    x = 35,189.72/180.87
  6. Step 6: Final answer
    x = 194.56

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.