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Finding the Fourth Proportional to 218.24, 327.20 and 81.29

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Solution

The fourth proportional to 218.24, 327.20 and 81.29 is: 121.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    218.24 : 327.20 = 81.29 : x
  2. Step 2: Convert to fraction form
    218.24/327.20 = 81.29/x
  3. Step 3: Cross multiply
    218.24x = 327.20 × 81.29
  4. Step 4: Simplify right side
    218.24x = 26,596.05
  5. Step 5: Solve for x
    x = 26,596.05/218.24
  6. Step 6: Final answer
    x = 121.87

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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.