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Finding the Fourth Proportional to 396.36, 591.03 and 391.41

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Solution

The fourth proportional to 396.36, 591.03 and 391.41 is: 583.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    396.36 : 591.03 = 391.41 : x
  2. Step 2: Convert to fraction form
    396.36/591.03 = 391.41/x
  3. Step 3: Cross multiply
    396.36x = 591.03 × 391.41
  4. Step 4: Simplify right side
    396.36x = 231,335.05
  5. Step 5: Solve for x
    x = 231,335.05/396.36
  6. Step 6: Final answer
    x = 583.65

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.