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Finding the Third Proportional to 11,928 and 18,420

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Solution

The third proportional to 11,928 and 18,420 is: 28,445.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    11,928 : 18,420 = 18,420 : x
  2. Step 2: Convert to fraction form
    11,928/18,420 = 18,420/x
  3. Step 3: Cross multiply
    11,928x = 18,420 × 18,420
  4. Step 4: Simplify right side
    11,928x = 339,296,400
  5. Step 5: Solve for x
    x = 339,296,400/11,928
  6. Step 6: Final answer
    x = 28,445.37

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Why These Related Problems?

These problems maintain the same ratio (1.54) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.