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Finding the Fourth Proportional to 327.79, 491.86 and 217.83

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Solution

The fourth proportional to 327.79, 491.86 and 217.83 is: 326.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    327.79 : 491.86 = 217.83 : x
  2. Step 2: Convert to fraction form
    327.79/491.86 = 217.83/x
  3. Step 3: Cross multiply
    327.79x = 491.86 × 217.83
  4. Step 4: Simplify right side
    327.79x = 107,143.98
  5. Step 5: Solve for x
    x = 107,143.98/327.79
  6. Step 6: Final answer
    x = 326.87

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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.