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Finding the Third Proportional to 18,912 and 39,758

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Solution

The third proportional to 18,912 and 39,758 is: 83,581.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,912 : 39,758 = 39,758 : x
  2. Step 2: Convert to fraction form
    18,912/39,758 = 39,758/x
  3. Step 3: Cross multiply
    18,912x = 39,758 × 39,758
  4. Step 4: Simplify right side
    18,912x = 1,580,698,564
  5. Step 5: Solve for x
    x = 1,580,698,564/18,912
  6. Step 6: Final answer
    x = 83,581.78

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Why These Related Problems?

These problems maintain the same ratio (2.10) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.