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Finding the Fourth Proportional to 396.39, 594.09 and 280.65

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Solution

The fourth proportional to 396.39, 594.09 and 280.65 is: 420.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    396.39 : 594.09 = 280.65 : x
  2. Step 2: Convert to fraction form
    396.39/594.09 = 280.65/x
  3. Step 3: Cross multiply
    396.39x = 594.09 × 280.65
  4. Step 4: Simplify right side
    396.39x = 166,731.36
  5. Step 5: Solve for x
    x = 166,731.36/396.39
  6. Step 6: Final answer
    x = 420.62

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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.