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Finding the Third Proportional to 3,121.50 and 7,109

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Solution

The third proportional to 3,121.50 and 7,109 is: 16,190.26

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,121.50 : 7,109 = 7,109 : x
  2. Step 2: Convert to fraction form
    3,121.50/7,109 = 7,109/x
  3. Step 3: Cross multiply
    3,121.50x = 7,109 × 7,109
  4. Step 4: Simplify right side
    3,121.50x = 50,537,881
  5. Step 5: Solve for x
    x = 50,537,881/3,121.50
  6. Step 6: Final answer
    x = 16,190.26

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Why These Related Problems?

These problems maintain the same ratio (2.28) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.