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Finding the Third Proportional to 21,746 and 31,981

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Solution

The third proportional to 21,746 and 31,981 is: 47,033.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,746 : 31,981 = 31,981 : x
  2. Step 2: Convert to fraction form
    21,746/31,981 = 31,981/x
  3. Step 3: Cross multiply
    21,746x = 31,981 × 31,981
  4. Step 4: Simplify right side
    21,746x = 1,022,784,361
  5. Step 5: Solve for x
    x = 1,022,784,361/21,746
  6. Step 6: Final answer
    x = 47,033.22

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Why These Related Problems?

These problems maintain the same ratio (1.47) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.