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Finding the Third Proportional to 17,989.50 and 39,138

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Solution

The third proportional to 17,989.50 and 39,138 is: 85,148.73

Step by Step Solution

  1. Step 1: Write the proportion equation
    17,989.50 : 39,138 = 39,138 : x
  2. Step 2: Convert to fraction form
    17,989.50/39,138 = 39,138/x
  3. Step 3: Cross multiply
    17,989.50x = 39,138 × 39,138
  4. Step 4: Simplify right side
    17,989.50x = 1,531,783,044
  5. Step 5: Solve for x
    x = 1,531,783,044/17,989.50
  6. Step 6: Final answer
    x = 85,148.73

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Why These Related Problems?

These problems maintain the same ratio (2.18) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.