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Finding the Fourth Proportional to 393.76, 591.13 and 326.09

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Solution

The fourth proportional to 393.76, 591.13 and 326.09 is: 489.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    393.76 : 591.13 = 326.09 : x
  2. Step 2: Convert to fraction form
    393.76/591.13 = 326.09/x
  3. Step 3: Cross multiply
    393.76x = 591.13 × 326.09
  4. Step 4: Simplify right side
    393.76x = 192,763.47
  5. Step 5: Solve for x
    x = 192,763.47/393.76
  6. Step 6: Final answer
    x = 489.54

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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.