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Finding the Fourth Proportional to 217.38, 326.12 and 80.43

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Solution

The fourth proportional to 217.38, 326.12 and 80.43 is: 120.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    217.38 : 326.12 = 80.43 : x
  2. Step 2: Convert to fraction form
    217.38/326.12 = 80.43/x
  3. Step 3: Cross multiply
    217.38x = 326.12 × 80.43
  4. Step 4: Simplify right side
    217.38x = 26,228.81
  5. Step 5: Solve for x
    x = 26,228.81/217.38
  6. Step 6: Final answer
    x = 120.66

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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.