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Finding the Fourth Proportional to 217.86, 326.82 and 109.68

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Solution

The fourth proportional to 217.86, 326.82 and 109.68 is: 164.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    217.86 : 326.82 = 109.68 : x
  2. Step 2: Convert to fraction form
    217.86/326.82 = 109.68/x
  3. Step 3: Cross multiply
    217.86x = 326.82 × 109.68
  4. Step 4: Simplify right side
    217.86x = 35,845.62
  5. Step 5: Solve for x
    x = 35,845.62/217.86
  6. Step 6: Final answer
    x = 164.54

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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.