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Finding the Fourth Proportional to 276.11, 381.51 and 211.11

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Solution

The fourth proportional to 276.11, 381.51 and 211.11 is: 291.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    276.11 : 381.51 = 211.11 : x
  2. Step 2: Convert to fraction form
    276.11/381.51 = 211.11/x
  3. Step 3: Cross multiply
    276.11x = 381.51 × 211.11
  4. Step 4: Simplify right side
    276.11x = 80,539.15
  5. Step 5: Solve for x
    x = 80,539.15/276.11
  6. Step 6: Final answer
    x = 291.69

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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.