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Finding the Third Proportional to 7,215 and 11,997

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Solution

The third proportional to 7,215 and 11,997 is: 19,948.44

Step by Step Solution

  1. Step 1: Write the proportion equation
    7,215 : 11,997 = 11,997 : x
  2. Step 2: Convert to fraction form
    7,215/11,997 = 11,997/x
  3. Step 3: Cross multiply
    7,215x = 11,997 × 11,997
  4. Step 4: Simplify right side
    7,215x = 143,928,009
  5. Step 5: Solve for x
    x = 143,928,009/7,215
  6. Step 6: Final answer
    x = 19,948.44

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Why These Related Problems?

These problems maintain the same ratio (1.66) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.