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Finding the Fourth Proportional to 217.81, 326.72 and 126.44

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Solution

The fourth proportional to 217.81, 326.72 and 126.44 is: 189.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    217.81 : 326.72 = 126.44 : x
  2. Step 2: Convert to fraction form
    217.81/326.72 = 126.44/x
  3. Step 3: Cross multiply
    217.81x = 326.72 × 126.44
  4. Step 4: Simplify right side
    217.81x = 41,309.16
  5. Step 5: Solve for x
    x = 41,309.16/217.81
  6. Step 6: Final answer
    x = 189.66

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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.