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Finding the Third Proportional to 12,840 and 18,028

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Solution

The third proportional to 12,840 and 18,028 is: 25,312.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,840 : 18,028 = 18,028 : x
  2. Step 2: Convert to fraction form
    12,840/18,028 = 18,028/x
  3. Step 3: Cross multiply
    12,840x = 18,028 × 18,028
  4. Step 4: Simplify right side
    12,840x = 325,008,784
  5. Step 5: Solve for x
    x = 325,008,784/12,840
  6. Step 6: Final answer
    x = 25,312.21

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Why These Related Problems?

These problems maintain the same ratio (1.40) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.