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Finding the Third Proportional to 19,890 and 27,878

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Solution

The third proportional to 19,890 and 27,878 is: 39,074.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    19,890 : 27,878 = 27,878 : x
  2. Step 2: Convert to fraction form
    19,890/27,878 = 27,878/x
  3. Step 3: Cross multiply
    19,890x = 27,878 × 27,878
  4. Step 4: Simplify right side
    19,890x = 777,182,884
  5. Step 5: Solve for x
    x = 777,182,884/19,890
  6. Step 6: Final answer
    x = 39,074.05

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Why These Related Problems?

These problems maintain the same ratio (1.40) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.