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Finding the Fourth Proportional to 218.02, 326.85 and 81.04

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Solution

The fourth proportional to 218.02, 326.85 and 81.04 is: 121.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    218.02 : 326.85 = 81.04 : x
  2. Step 2: Convert to fraction form
    218.02/326.85 = 81.04/x
  3. Step 3: Cross multiply
    218.02x = 326.85 × 81.04
  4. Step 4: Simplify right side
    218.02x = 26,489.65
  5. Step 5: Solve for x
    x = 26,489.65/218.02
  6. Step 6: Final answer
    x = 121.50

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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.