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Finding the Fourth Proportional to 326.78, 490.13 and 83.31

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Solution

The fourth proportional to 326.78, 490.13 and 83.31 is: 124.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    326.78 : 490.13 = 83.31 : x
  2. Step 2: Convert to fraction form
    326.78/490.13 = 83.31/x
  3. Step 3: Cross multiply
    326.78x = 490.13 × 83.31
  4. Step 4: Simplify right side
    326.78x = 40,832.94
  5. Step 5: Solve for x
    x = 40,832.94/326.78
  6. Step 6: Final answer
    x = 124.95

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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.