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Finding the Fourth Proportional to 276.70, 381.90 and 189.50

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Solution

The fourth proportional to 276.70, 381.90 and 189.50 is: 261.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    276.70 : 381.90 = 189.50 : x
  2. Step 2: Convert to fraction form
    276.70/381.90 = 189.50/x
  3. Step 3: Cross multiply
    276.70x = 381.90 × 189.50
  4. Step 4: Simplify right side
    276.70x = 72,370.05
  5. Step 5: Solve for x
    x = 72,370.05/276.70
  6. Step 6: Final answer
    x = 261.55

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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.