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Finding the Third Proportional to 3,972 and 8,638.50

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Solution

The third proportional to 3,972 and 8,638.50 is: 18,787.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,972 : 8,638.50 = 8,638.50 : x
  2. Step 2: Convert to fraction form
    3,972/8,638.50 = 8,638.50/x
  3. Step 3: Cross multiply
    3,972x = 8,638.50 × 8,638.50
  4. Step 4: Simplify right side
    3,972x = 74,623,682.25
  5. Step 5: Solve for x
    x = 74,623,682.25/3,972
  6. Step 6: Final answer
    x = 18,787.43

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Why These Related Problems?

These problems maintain the same ratio (2.17) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.