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Finding the Third Proportional to 9,904 and 21,220

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Solution

The third proportional to 9,904 and 21,220 is: 45,465.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    9,904 : 21,220 = 21,220 : x
  2. Step 2: Convert to fraction form
    9,904/21,220 = 21,220/x
  3. Step 3: Cross multiply
    9,904x = 21,220 × 21,220
  4. Step 4: Simplify right side
    9,904x = 450,288,400
  5. Step 5: Solve for x
    x = 450,288,400/9,904
  6. Step 6: Final answer
    x = 45,465.31

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Why These Related Problems?

These problems maintain the same ratio (2.14) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.