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Finding the Third Proportional to 18,870 and 39,806

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Solution

The third proportional to 18,870 and 39,806 is: 83,970.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,870 : 39,806 = 39,806 : x
  2. Step 2: Convert to fraction form
    18,870/39,806 = 39,806/x
  3. Step 3: Cross multiply
    18,870x = 39,806 × 39,806
  4. Step 4: Simplify right side
    18,870x = 1,584,517,636
  5. Step 5: Solve for x
    x = 1,584,517,636/18,870
  6. Step 6: Final answer
    x = 83,970.20

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Why These Related Problems?

These problems maintain the same ratio (2.11) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.