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Finding the Fourth Proportional to 218.66, 327.89 and 81.68

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Solution

The fourth proportional to 218.66, 327.89 and 81.68 is: 122.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    218.66 : 327.89 = 81.68 : x
  2. Step 2: Convert to fraction form
    218.66/327.89 = 81.68/x
  3. Step 3: Cross multiply
    218.66x = 327.89 × 81.68
  4. Step 4: Simplify right side
    218.66x = 26,780.01
  5. Step 5: Solve for x
    x = 26,780.01/218.66
  6. Step 6: Final answer
    x = 122.48

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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.