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Finding the Fourth Proportional to 218.66, 327.98 and 85.11

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Solution

The fourth proportional to 218.66, 327.98 and 85.11 is: 127.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    218.66 : 327.98 = 85.11 : x
  2. Step 2: Convert to fraction form
    218.66/327.98 = 85.11/x
  3. Step 3: Cross multiply
    218.66x = 327.98 × 85.11
  4. Step 4: Simplify right side
    218.66x = 27,913.95
  5. Step 5: Solve for x
    x = 27,913.95/218.66
  6. Step 6: Final answer
    x = 127.66

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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.