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Finding the Third Proportional to 12,720 and 18,168

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Solution

The third proportional to 12,720 and 18,168 is: 25,949.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,720 : 18,168 = 18,168 : x
  2. Step 2: Convert to fraction form
    12,720/18,168 = 18,168/x
  3. Step 3: Cross multiply
    12,720x = 18,168 × 18,168
  4. Step 4: Simplify right side
    12,720x = 330,076,224
  5. Step 5: Solve for x
    x = 330,076,224/12,720
  6. Step 6: Final answer
    x = 25,949.39

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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.