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Finding the Fourth Proportional to 663.97, 996 and 201.78

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Solution

The fourth proportional to 663.97, 996 and 201.78 is: 302.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    663.97 : 996 = 201.78 : x
  2. Step 2: Convert to fraction form
    663.97/996 = 201.78/x
  3. Step 3: Cross multiply
    663.97x = 996 × 201.78
  4. Step 4: Simplify right side
    663.97x = 200,972.88
  5. Step 5: Solve for x
    x = 200,972.88/663.97
  6. Step 6: Final answer
    x = 302.68

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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.