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Finding the Third Proportional to 7,855 and 11,009

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Solution

The third proportional to 7,855 and 11,009 is: 15,429.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    7,855 : 11,009 = 11,009 : x
  2. Step 2: Convert to fraction form
    7,855/11,009 = 11,009/x
  3. Step 3: Cross multiply
    7,855x = 11,009 × 11,009
  4. Step 4: Simplify right side
    7,855x = 121,198,081
  5. Step 5: Solve for x
    x = 121,198,081/7,855
  6. Step 6: Final answer
    x = 15,429.42

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Why These Related Problems?

These problems maintain the same ratio (1.40) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.