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Finding the Third Proportional to 12,640 and 18,136

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Solution

The third proportional to 12,640 and 18,136 is: 26,021.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,640 : 18,136 = 18,136 : x
  2. Step 2: Convert to fraction form
    12,640/18,136 = 18,136/x
  3. Step 3: Cross multiply
    12,640x = 18,136 × 18,136
  4. Step 4: Simplify right side
    12,640x = 328,914,496
  5. Step 5: Solve for x
    x = 328,914,496/12,640
  6. Step 6: Final answer
    x = 26,021.72

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Why These Related Problems?

These problems maintain the same ratio (1.43) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.