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Finding the Third Proportional to 1,912 and 3,945

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Solution

The third proportional to 1,912 and 3,945 is: 8,139.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,912 : 3,945 = 3,945 : x
  2. Step 2: Convert to fraction form
    1,912/3,945 = 3,945/x
  3. Step 3: Cross multiply
    1,912x = 3,945 × 3,945
  4. Step 4: Simplify right side
    1,912x = 15,563,025
  5. Step 5: Solve for x
    x = 15,563,025/1,912
  6. Step 6: Final answer
    x = 8,139.66

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Why These Related Problems?

These problems maintain the same ratio (2.06) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.