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Finding the Fourth Proportional to 276.56, 381.60 and 189.20

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Solution

The fourth proportional to 276.56, 381.60 and 189.20 is: 261.06

Step by Step Solution

  1. Step 1: Write the proportion equation
    276.56 : 381.60 = 189.20 : x
  2. Step 2: Convert to fraction form
    276.56/381.60 = 189.20/x
  3. Step 3: Cross multiply
    276.56x = 381.60 × 189.20
  4. Step 4: Simplify right side
    276.56x = 72,198.72
  5. Step 5: Solve for x
    x = 72,198.72/276.56
  6. Step 6: Final answer
    x = 261.06

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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.