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Finding the Fourth Proportional to 276.03, 381.31 and 261.45

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Solution

The fourth proportional to 276.03, 381.31 and 261.45 is: 361.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    276.03 : 381.31 = 261.45 : x
  2. Step 2: Convert to fraction form
    276.03/381.31 = 261.45/x
  3. Step 3: Cross multiply
    276.03x = 381.31 × 261.45
  4. Step 4: Simplify right side
    276.03x = 99,692.85
  5. Step 5: Solve for x
    x = 99,692.85/276.03
  6. Step 6: Final answer
    x = 361.17

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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.