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Finding the Third Proportional to 18,688.50 and 39,672

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Solution

The third proportional to 18,688.50 and 39,672 is: 84,215.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,688.50 : 39,672 = 39,672 : x
  2. Step 2: Convert to fraction form
    18,688.50/39,672 = 39,672/x
  3. Step 3: Cross multiply
    18,688.50x = 39,672 × 39,672
  4. Step 4: Simplify right side
    18,688.50x = 1,573,867,584
  5. Step 5: Solve for x
    x = 1,573,867,584/18,688.50
  6. Step 6: Final answer
    x = 84,215.83

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Why These Related Problems?

These problems maintain the same ratio (2.12) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.