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Finding the Third Proportional to 13,890 and 19,848.75

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Solution

The third proportional to 13,890 and 19,848.75 is: 28,363.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,890 : 19,848.75 = 19,848.75 : x
  2. Step 2: Convert to fraction form
    13,890/19,848.75 = 19,848.75/x
  3. Step 3: Cross multiply
    13,890x = 19,848.75 × 19,848.75
  4. Step 4: Simplify right side
    13,890x = 393,972,876.56
  5. Step 5: Solve for x
    x = 393,972,876.56/13,890
  6. Step 6: Final answer
    x = 28,363.78

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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.