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Finding the Third Proportional to 12,431.25 and 18,828

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Solution

The third proportional to 12,431.25 and 18,828 is: 28,516.33

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,431.25 : 18,828 = 18,828 : x
  2. Step 2: Convert to fraction form
    12,431.25/18,828 = 18,828/x
  3. Step 3: Cross multiply
    12,431.25x = 18,828 × 18,828
  4. Step 4: Simplify right side
    12,431.25x = 354,493,584
  5. Step 5: Solve for x
    x = 354,493,584/12,431.25
  6. Step 6: Final answer
    x = 28,516.33

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Why These Related Problems?

These problems maintain the same ratio (1.51) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.