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Finding the Fourth Proportional to 308.27, 425.49 and 197.78

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Solution

The fourth proportional to 308.27, 425.49 and 197.78 is: 272.99

Step by Step Solution

  1. Step 1: Write the proportion equation
    308.27 : 425.49 = 197.78 : x
  2. Step 2: Convert to fraction form
    308.27/425.49 = 197.78/x
  3. Step 3: Cross multiply
    308.27x = 425.49 × 197.78
  4. Step 4: Simplify right side
    308.27x = 84,153.41
  5. Step 5: Solve for x
    x = 84,153.41/308.27
  6. Step 6: Final answer
    x = 272.99

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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.