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Finding the Third Proportional to 42,718 and 68,243

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Solution

The third proportional to 42,718 and 68,243 is: 109,019.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    42,718 : 68,243 = 68,243 : x
  2. Step 2: Convert to fraction form
    42,718/68,243 = 68,243/x
  3. Step 3: Cross multiply
    42,718x = 68,243 × 68,243
  4. Step 4: Simplify right side
    42,718x = 4,657,107,049
  5. Step 5: Solve for x
    x = 4,657,107,049/42,718
  6. Step 6: Final answer
    x = 109,019.78

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Why These Related Problems?

These problems maintain the same ratio (1.60) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.