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Finding the Fourth Proportional to 326.24, 489.28 and 218.12

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Solution

The fourth proportional to 326.24, 489.28 and 218.12 is: 327.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    326.24 : 489.28 = 218.12 : x
  2. Step 2: Convert to fraction form
    326.24/489.28 = 218.12/x
  3. Step 3: Cross multiply
    326.24x = 489.28 × 218.12
  4. Step 4: Simplify right side
    326.24x = 106,721.75
  5. Step 5: Solve for x
    x = 106,721.75/326.24
  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.