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Finding the Fourth Proportional to 217.91, 326.38 and 156.09

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Solution

The fourth proportional to 217.91, 326.38 and 156.09 is: 233.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    217.91 : 326.38 = 156.09 : x
  2. Step 2: Convert to fraction form
    217.91/326.38 = 156.09/x
  3. Step 3: Cross multiply
    217.91x = 326.38 × 156.09
  4. Step 4: Simplify right side
    217.91x = 50,944.65
  5. Step 5: Solve for x
    x = 50,944.65/217.91
  6. Step 6: Final answer
    x = 233.79

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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.