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Finding the Third Proportional to 15,009 and 20,403

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Solution

The third proportional to 15,009 and 20,403 is: 27,735.52

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,009 : 20,403 = 20,403 : x
  2. Step 2: Convert to fraction form
    15,009/20,403 = 20,403/x
  3. Step 3: Cross multiply
    15,009x = 20,403 × 20,403
  4. Step 4: Simplify right side
    15,009x = 416,282,409
  5. Step 5: Solve for x
    x = 416,282,409/15,009
  6. Step 6: Final answer
    x = 27,735.52

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Why These Related Problems?

These problems maintain the same ratio (1.36) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.