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Finding the Fourth Proportional to 218.00, 326.94 and 81.11

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Solution

The fourth proportional to 218.00, 326.94 and 81.11 is: 121.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    218.00 : 326.94 = 81.11 : x
  2. Step 2: Convert to fraction form
    218.00/326.94 = 81.11/x
  3. Step 3: Cross multiply
    218.00x = 326.94 × 81.11
  4. Step 4: Simplify right side
    218.00x = 26,516.47
  5. Step 5: Solve for x
    x = 26,516.47/218.00
  6. Step 6: Final answer
    x = 121.64

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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.