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Finding the Fourth Proportional to 276.89, 381.65 and 211.28

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Solution

The fourth proportional to 276.89, 381.65 and 211.28 is: 291.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    276.89 : 381.65 = 211.28 : x
  2. Step 2: Convert to fraction form
    276.89/381.65 = 211.28/x
  3. Step 3: Cross multiply
    276.89x = 381.65 × 211.28
  4. Step 4: Simplify right side
    276.89x = 80,632.05
  5. Step 5: Solve for x
    x = 80,632.05/276.89
  6. Step 6: Final answer
    x = 291.21

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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.