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Finding the Fourth Proportional to 396.60, 594.74 and 139.96

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Solution

The fourth proportional to 396.60, 594.74 and 139.96 is: 209.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    396.60 : 594.74 = 139.96 : x
  2. Step 2: Convert to fraction form
    396.60/594.74 = 139.96/x
  3. Step 3: Cross multiply
    396.60x = 594.74 × 139.96
  4. Step 4: Simplify right side
    396.60x = 83,239.81
  5. Step 5: Solve for x
    x = 83,239.81/396.60
  6. Step 6: Final answer
    x = 209.88

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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.