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Finding the Third Proportional to 18,691 and 40,318

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Solution

The third proportional to 18,691 and 40,318 is: 86,969.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,691 : 40,318 = 40,318 : x
  2. Step 2: Convert to fraction form
    18,691/40,318 = 40,318/x
  3. Step 3: Cross multiply
    18,691x = 40,318 × 40,318
  4. Step 4: Simplify right side
    18,691x = 1,625,541,124
  5. Step 5: Solve for x
    x = 1,625,541,124/18,691
  6. Step 6: Final answer
    x = 86,969.19

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Why These Related Problems?

These problems maintain the same ratio (2.16) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.