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Finding the Third Proportional to 2,009 and 4,321

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Solution

The third proportional to 2,009 and 4,321 is: 9,293.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,009 : 4,321 = 4,321 : x
  2. Step 2: Convert to fraction form
    2,009/4,321 = 4,321/x
  3. Step 3: Cross multiply
    2,009x = 4,321 × 4,321
  4. Step 4: Simplify right side
    2,009x = 18,671,041
  5. Step 5: Solve for x
    x = 18,671,041/2,009
  6. Step 6: Final answer
    x = 9,293.70

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Why These Related Problems?

These problems maintain the same ratio (2.15) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.