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Finding the Third Proportional to 12,643 and 18,640

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Solution

The third proportional to 12,643 and 18,640 is: 27,481.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,643 : 18,640 = 18,640 : x
  2. Step 2: Convert to fraction form
    12,643/18,640 = 18,640/x
  3. Step 3: Cross multiply
    12,643x = 18,640 × 18,640
  4. Step 4: Simplify right side
    12,643x = 347,449,600
  5. Step 5: Solve for x
    x = 347,449,600/12,643
  6. Step 6: Final answer
    x = 27,481.58

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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.