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Finding the Fourth Proportional to 276.25, 381.32 and 198.85

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Solution

The fourth proportional to 276.25, 381.32 and 198.85 is: 274.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    276.25 : 381.32 = 198.85 : x
  2. Step 2: Convert to fraction form
    276.25/381.32 = 198.85/x
  3. Step 3: Cross multiply
    276.25x = 381.32 × 198.85
  4. Step 4: Simplify right side
    276.25x = 75,825.48
  5. Step 5: Solve for x
    x = 75,825.48/276.25
  6. Step 6: Final answer
    x = 274.48

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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.