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Finding the Fourth Proportional to 185.11, 255.53 and 129.85

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Solution

The fourth proportional to 185.11, 255.53 and 129.85 is: 179.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    185.11 : 255.53 = 129.85 : x
  2. Step 2: Convert to fraction form
    185.11/255.53 = 129.85/x
  3. Step 3: Cross multiply
    185.11x = 255.53 × 129.85
  4. Step 4: Simplify right side
    185.11x = 33,180.57
  5. Step 5: Solve for x
    x = 33,180.57/185.11
  6. Step 6: Final answer
    x = 179.25

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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.