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Finding the Third Proportional to 18,871 and 39,290

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Solution

The third proportional to 18,871 and 39,290 is: 81,802.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,871 : 39,290 = 39,290 : x
  2. Step 2: Convert to fraction form
    18,871/39,290 = 39,290/x
  3. Step 3: Cross multiply
    18,871x = 39,290 × 39,290
  4. Step 4: Simplify right side
    18,871x = 1,543,704,100
  5. Step 5: Solve for x
    x = 1,543,704,100/18,871
  6. Step 6: Final answer
    x = 81,802.98

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Why These Related Problems?

These problems maintain the same ratio (2.08) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.