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Finding the Fourth Proportional to 217.91, 327 and 126.78

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Solution

The fourth proportional to 217.91, 327 and 126.78 is: 190.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    217.91 : 327 = 126.78 : x
  2. Step 2: Convert to fraction form
    217.91/327 = 126.78/x
  3. Step 3: Cross multiply
    217.91x = 327 × 126.78
  4. Step 4: Simplify right side
    217.91x = 41,457.06
  5. Step 5: Solve for x
    x = 41,457.06/217.91
  6. Step 6: Final answer
    x = 190.25

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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.