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Finding the Fourth Proportional to 326.13, 489.19 and 217.69

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Solution

The fourth proportional to 326.13, 489.19 and 217.69 is: 326.53

Step by Step Solution

  1. Step 1: Write the proportion equation
    326.13 : 489.19 = 217.69 : x
  2. Step 2: Convert to fraction form
    326.13/489.19 = 217.69/x
  3. Step 3: Cross multiply
    326.13x = 489.19 × 217.69
  4. Step 4: Simplify right side
    326.13x = 106,490.41
  5. Step 5: Solve for x
    x = 106,490.41/326.13
  6. Step 6: Final answer
    x = 326.53

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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.