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Finding the Fourth Proportional to 326.97, 490.73 and 218.84

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Solution

The fourth proportional to 326.97, 490.73 and 218.84 is: 328.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    326.97 : 490.73 = 218.84 : x
  2. Step 2: Convert to fraction form
    326.97/490.73 = 218.84/x
  3. Step 3: Cross multiply
    326.97x = 490.73 × 218.84
  4. Step 4: Simplify right side
    326.97x = 107,387.81
  5. Step 5: Solve for x
    x = 107,387.81/326.97
  6. Step 6: Final answer
    x = 328.43

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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.