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Finding the Fourth Proportional to 308.99, 426.22 and 198.43

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Solution

The fourth proportional to 308.99, 426.22 and 198.43 is: 273.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    308.99 : 426.22 = 198.43 : x
  2. Step 2: Convert to fraction form
    308.99/426.22 = 198.43/x
  3. Step 3: Cross multiply
    308.99x = 426.22 × 198.43
  4. Step 4: Simplify right side
    308.99x = 84,573.27
  5. Step 5: Solve for x
    x = 84,573.27/308.99
  6. Step 6: Final answer
    x = 273.71

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.