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Finding the Fourth Proportional to 218.78, 327.98 and 109.02

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Solution

The fourth proportional to 218.78, 327.98 and 109.02 is: 163.44

Step by Step Solution

  1. Step 1: Write the proportion equation
    218.78 : 327.98 = 109.02 : x
  2. Step 2: Convert to fraction form
    218.78/327.98 = 109.02/x
  3. Step 3: Cross multiply
    218.78x = 327.98 × 109.02
  4. Step 4: Simplify right side
    218.78x = 35,757.88
  5. Step 5: Solve for x
    x = 35,757.88/218.78
  6. Step 6: Final answer
    x = 163.44

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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.