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Finding the Third Proportional to 7,870 and 15,866

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Solution

The third proportional to 7,870 and 15,866 is: 31,986.02

Step by Step Solution

  1. Step 1: Write the proportion equation
    7,870 : 15,866 = 15,866 : x
  2. Step 2: Convert to fraction form
    7,870/15,866 = 15,866/x
  3. Step 3: Cross multiply
    7,870x = 15,866 × 15,866
  4. Step 4: Simplify right side
    7,870x = 251,729,956
  5. Step 5: Solve for x
    x = 251,729,956/7,870
  6. Step 6: Final answer
    x = 31,986.02

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Why These Related Problems?

These problems maintain the same ratio (2.02) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.