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Finding the Fourth Proportional to 180.88, 249.72 and 122.80

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Solution

The fourth proportional to 180.88, 249.72 and 122.80 is: 169.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    180.88 : 249.72 = 122.80 : x
  2. Step 2: Convert to fraction form
    180.88/249.72 = 122.80/x
  3. Step 3: Cross multiply
    180.88x = 249.72 × 122.80
  4. Step 4: Simplify right side
    180.88x = 30,665.62
  5. Step 5: Solve for x
    x = 30,665.62/180.88
  6. Step 6: Final answer
    x = 169.54

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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.