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Finding the Fourth Proportional to 217.76, 326.38 and 80.71

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Solution

The fourth proportional to 217.76, 326.38 and 80.71 is: 120.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    217.76 : 326.38 = 80.71 : x
  2. Step 2: Convert to fraction form
    217.76/326.38 = 80.71/x
  3. Step 3: Cross multiply
    217.76x = 326.38 × 80.71
  4. Step 4: Simplify right side
    217.76x = 26,343.10
  5. Step 5: Solve for x
    x = 26,343.10/217.76
  6. Step 6: Final answer
    x = 120.98

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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.