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Finding the Fourth Proportional to 308.72, 426.08 and 198.18

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Solution

The fourth proportional to 308.72, 426.08 and 198.18 is: 273.52

Step by Step Solution

  1. Step 1: Write the proportion equation
    308.72 : 426.08 = 198.18 : x
  2. Step 2: Convert to fraction form
    308.72/426.08 = 198.18/x
  3. Step 3: Cross multiply
    308.72x = 426.08 × 198.18
  4. Step 4: Simplify right side
    308.72x = 84,439.54
  5. Step 5: Solve for x
    x = 84,439.54/308.72
  6. Step 6: Final answer
    x = 273.52

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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.