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Finding the Fourth Proportional to 381, 571.20 and 198.42

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Solution

The fourth proportional to 381, 571.20 and 198.42 is: 297.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    381 : 571.20 = 198.42 : x
  2. Step 2: Convert to fraction form
    381/571.20 = 198.42/x
  3. Step 3: Cross multiply
    381x = 571.20 × 198.42
  4. Step 4: Simplify right side
    381x = 113,337.50
  5. Step 5: Solve for x
    x = 113,337.50/381
  6. Step 6: Final answer
    x = 297.47

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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.