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Finding the Fourth Proportional to 180.50, 249.30 and 122.18

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Solution

The fourth proportional to 180.50, 249.30 and 122.18 is: 168.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    180.50 : 249.30 = 122.18 : x
  2. Step 2: Convert to fraction form
    180.50/249.30 = 122.18/x
  3. Step 3: Cross multiply
    180.50x = 249.30 × 122.18
  4. Step 4: Simplify right side
    180.50x = 30,458.86
  5. Step 5: Solve for x
    x = 30,458.86/180.50
  6. Step 6: Final answer
    x = 168.75

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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.