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Finding the Fourth Proportional to 396.28, 594.44 and 139.80

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Solution

The fourth proportional to 396.28, 594.44 and 139.80 is: 209.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    396.28 : 594.44 = 139.80 : x
  2. Step 2: Convert to fraction form
    396.28/594.44 = 139.80/x
  3. Step 3: Cross multiply
    396.28x = 594.44 × 139.80
  4. Step 4: Simplify right side
    396.28x = 83,102.71
  5. Step 5: Solve for x
    x = 83,102.71/396.28
  6. Step 6: Final answer
    x = 209.71

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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.