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Finding the Fourth Proportional to 276.40, 381.27 and 196.66

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Solution

The fourth proportional to 276.40, 381.27 and 196.66 is: 271.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    276.40 : 381.27 = 196.66 : x
  2. Step 2: Convert to fraction form
    276.40/381.27 = 196.66/x
  3. Step 3: Cross multiply
    276.40x = 381.27 × 196.66
  4. Step 4: Simplify right side
    276.40x = 74,980.56
  5. Step 5: Solve for x
    x = 74,980.56/276.40
  6. Step 6: Final answer
    x = 271.28

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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.