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Finding the Third Proportional to 21,908 and 47,820

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Solution

The third proportional to 21,908 and 47,820 is: 104,379.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,908 : 47,820 = 47,820 : x
  2. Step 2: Convert to fraction form
    21,908/47,820 = 47,820/x
  3. Step 3: Cross multiply
    21,908x = 47,820 × 47,820
  4. Step 4: Simplify right side
    21,908x = 2,286,752,400
  5. Step 5: Solve for x
    x = 2,286,752,400/21,908
  6. Step 6: Final answer
    x = 104,379.79

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Why These Related Problems?

These problems maintain the same ratio (2.18) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.