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Finding the Fourth Proportional to 276.12, 381 and 171.22

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Solution

The fourth proportional to 276.12, 381 and 171.22 is: 236.26

Step by Step Solution

  1. Step 1: Write the proportion equation
    276.12 : 381 = 171.22 : x
  2. Step 2: Convert to fraction form
    276.12/381 = 171.22/x
  3. Step 3: Cross multiply
    276.12x = 381 × 171.22
  4. Step 4: Simplify right side
    276.12x = 65,234.82
  5. Step 5: Solve for x
    x = 65,234.82/276.12
  6. Step 6: Final answer
    x = 236.26

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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.