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Finding the Fourth Proportional to 326.39, 489.31 and 218.21

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Solution

The fourth proportional to 326.39, 489.31 and 218.21 is: 327.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    326.39 : 489.31 = 218.21 : x
  2. Step 2: Convert to fraction form
    326.39/489.31 = 218.21/x
  3. Step 3: Cross multiply
    326.39x = 489.31 × 218.21
  4. Step 4: Simplify right side
    326.39x = 106,769.34
  5. Step 5: Solve for x
    x = 106,769.34/326.39
  6. Step 6: Final answer
    x = 327.13

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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.