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Finding the Fourth Proportional to 276.44, 381.58 and 189.12

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Solution

The fourth proportional to 276.44, 381.58 and 189.12 is: 261.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    276.44 : 381.58 = 189.12 : x
  2. Step 2: Convert to fraction form
    276.44/381.58 = 189.12/x
  3. Step 3: Cross multiply
    276.44x = 381.58 × 189.12
  4. Step 4: Simplify right side
    276.44x = 72,164.41
  5. Step 5: Solve for x
    x = 72,164.41/276.44
  6. Step 6: Final answer
    x = 261.05

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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.