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Finding the Fourth Proportional to 326.43, 490.65 and 218.91

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Solution

The fourth proportional to 326.43, 490.65 and 218.91 is: 329.04

Step by Step Solution

  1. Step 1: Write the proportion equation
    326.43 : 490.65 = 218.91 : x
  2. Step 2: Convert to fraction form
    326.43/490.65 = 218.91/x
  3. Step 3: Cross multiply
    326.43x = 490.65 × 218.91
  4. Step 4: Simplify right side
    326.43x = 107,408.19
  5. Step 5: Solve for x
    x = 107,408.19/326.43
  6. Step 6: Final answer
    x = 329.04

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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.