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Finding the Third Proportional to 7,940 and 12,446

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Solution

The third proportional to 7,940 and 12,446 is: 19,509.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    7,940 : 12,446 = 12,446 : x
  2. Step 2: Convert to fraction form
    7,940/12,446 = 12,446/x
  3. Step 3: Cross multiply
    7,940x = 12,446 × 12,446
  4. Step 4: Simplify right side
    7,940x = 154,902,916
  5. Step 5: Solve for x
    x = 154,902,916/7,940
  6. Step 6: Final answer
    x = 19,509.18

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Why These Related Problems?

These problems maintain the same ratio (1.57) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.