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Finding the Fourth Proportional to 221.22, 329.78 and 217.71

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Solution

The fourth proportional to 221.22, 329.78 and 217.71 is: 324.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    221.22 : 329.78 = 217.71 : x
  2. Step 2: Convert to fraction form
    221.22/329.78 = 217.71/x
  3. Step 3: Cross multiply
    221.22x = 329.78 × 217.71
  4. Step 4: Simplify right side
    221.22x = 71,796.95
  5. Step 5: Solve for x
    x = 71,796.95/221.22
  6. Step 6: Final answer
    x = 324.55

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.