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Finding the Third Proportional to 251.06 and 381.56

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Solution

The third proportional to 251.06 and 381.56 is: 579.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    251.06 : 381.56 = 381.56 : x
  2. Step 2: Convert to fraction form
    251.06/381.56 = 381.56/x
  3. Step 3: Cross multiply
    251.06x = 381.56 × 381.56
  4. Step 4: Simplify right side
    251.06x = 145,589.94
  5. Step 5: Solve for x
    x = 145,589.94/251.06
  6. Step 6: Final answer
    x = 579.90

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Why These Related Problems?

These problems maintain the same ratio (1.52) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.