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Finding the Fourth Proportional to 308.96, 426.41 and 189.39

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Solution

The fourth proportional to 308.96, 426.41 and 189.39 is: 261.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    308.96 : 426.41 = 189.39 : x
  2. Step 2: Convert to fraction form
    308.96/426.41 = 189.39/x
  3. Step 3: Cross multiply
    308.96x = 426.41 × 189.39
  4. Step 4: Simplify right side
    308.96x = 80,757.38
  5. Step 5: Solve for x
    x = 80,757.38/308.96
  6. Step 6: Final answer
    x = 261.39

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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.