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Finding the Third Proportional to 21,878 and 51,419

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Solution

The third proportional to 21,878 and 51,419 is: 120,848.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,878 : 51,419 = 51,419 : x
  2. Step 2: Convert to fraction form
    21,878/51,419 = 51,419/x
  3. Step 3: Cross multiply
    21,878x = 51,419 × 51,419
  4. Step 4: Simplify right side
    21,878x = 2,643,913,561
  5. Step 5: Solve for x
    x = 2,643,913,561/21,878
  6. Step 6: Final answer
    x = 120,848.05

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Why These Related Problems?

These problems maintain the same ratio (2.35) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.