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Finding the Fourth Proportional to 276.36, 381.28 and 198.76

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Solution

The fourth proportional to 276.36, 381.28 and 198.76 is: 274.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    276.36 : 381.28 = 198.76 : x
  2. Step 2: Convert to fraction form
    276.36/381.28 = 198.76/x
  3. Step 3: Cross multiply
    276.36x = 381.28 × 198.76
  4. Step 4: Simplify right side
    276.36x = 75,783.21
  5. Step 5: Solve for x
    x = 75,783.21/276.36
  6. Step 6: Final answer
    x = 274.22

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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.