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Finding the Fourth Proportional to 489.40, 733.74 and 326.68

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Solution

The fourth proportional to 489.40, 733.74 and 326.68 is: 489.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    489.40 : 733.74 = 326.68 : x
  2. Step 2: Convert to fraction form
    489.40/733.74 = 326.68/x
  3. Step 3: Cross multiply
    489.40x = 733.74 × 326.68
  4. Step 4: Simplify right side
    489.40x = 239,698.18
  5. Step 5: Solve for x
    x = 239,698.18/489.40
  6. Step 6: Final answer
    x = 489.78

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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.