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Finding the Fourth Proportional to 308.99, 426.12 and 198.56

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Solution

The fourth proportional to 308.99, 426.12 and 198.56 is: 273.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    308.99 : 426.12 = 198.56 : x
  2. Step 2: Convert to fraction form
    308.99/426.12 = 198.56/x
  3. Step 3: Cross multiply
    308.99x = 426.12 × 198.56
  4. Step 4: Simplify right side
    308.99x = 84,610.39
  5. Step 5: Solve for x
    x = 84,610.39/308.99
  6. Step 6: Final answer
    x = 273.83

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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.