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Finding the Third Proportional to 9,789 and 21,171

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Solution

The third proportional to 9,789 and 21,171 is: 45,787.23

Step by Step Solution

  1. Step 1: Write the proportion equation
    9,789 : 21,171 = 21,171 : x
  2. Step 2: Convert to fraction form
    9,789/21,171 = 21,171/x
  3. Step 3: Cross multiply
    9,789x = 21,171 × 21,171
  4. Step 4: Simplify right side
    9,789x = 448,211,241
  5. Step 5: Solve for x
    x = 448,211,241/9,789
  6. Step 6: Final answer
    x = 45,787.23

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Why These Related Problems?

These problems maintain the same ratio (2.16) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.