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Finding the Fourth Proportional to 185.25, 255.45 and 129.90

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Solution

The fourth proportional to 185.25, 255.45 and 129.90 is: 179.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    185.25 : 255.45 = 129.90 : x
  2. Step 2: Convert to fraction form
    185.25/255.45 = 129.90/x
  3. Step 3: Cross multiply
    185.25x = 255.45 × 129.90
  4. Step 4: Simplify right side
    185.25x = 33,182.96
  5. Step 5: Solve for x
    x = 33,182.96/185.25
  6. Step 6: Final answer
    x = 179.13

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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.