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Finding the Fourth Proportional to 218.14, 327.20 and 71.89

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Solution

The fourth proportional to 218.14, 327.20 and 71.89 is: 107.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    218.14 : 327.20 = 71.89 : x
  2. Step 2: Convert to fraction form
    218.14/327.20 = 71.89/x
  3. Step 3: Cross multiply
    218.14x = 327.20 × 71.89
  4. Step 4: Simplify right side
    218.14x = 23,521.23
  5. Step 5: Solve for x
    x = 23,521.23/218.14
  6. Step 6: Final answer
    x = 107.83

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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.