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Finding the Fourth Proportional to 308.78, 425.99 and 203.92

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Solution

The fourth proportional to 308.78, 425.99 and 203.92 is: 281.33

Step by Step Solution

  1. Step 1: Write the proportion equation
    308.78 : 425.99 = 203.92 : x
  2. Step 2: Convert to fraction form
    308.78/425.99 = 203.92/x
  3. Step 3: Cross multiply
    308.78x = 425.99 × 203.92
  4. Step 4: Simplify right side
    308.78x = 86,868.52
  5. Step 5: Solve for x
    x = 86,868.52/308.78
  6. Step 6: Final answer
    x = 281.33

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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.