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Finding the Fourth Proportional to 218.09, 326.89 and 100.88

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Solution

The fourth proportional to 218.09, 326.89 and 100.88 is: 151.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    218.09 : 326.89 = 100.88 : x
  2. Step 2: Convert to fraction form
    218.09/326.89 = 100.88/x
  3. Step 3: Cross multiply
    218.09x = 326.89 × 100.88
  4. Step 4: Simplify right side
    218.09x = 32,976.66
  5. Step 5: Solve for x
    x = 32,976.66/218.09
  6. Step 6: Final answer
    x = 151.21

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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.