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Finding the Third Proportional to 6,940 and 9,978

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Solution

The third proportional to 6,940 and 9,978 is: 14,345.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    6,940 : 9,978 = 9,978 : x
  2. Step 2: Convert to fraction form
    6,940/9,978 = 9,978/x
  3. Step 3: Cross multiply
    6,940x = 9,978 × 9,978
  4. Step 4: Simplify right side
    6,940x = 99,560,484
  5. Step 5: Solve for x
    x = 99,560,484/6,940
  6. Step 6: Final answer
    x = 14,345.89

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Why These Related Problems?

These problems maintain the same ratio (1.44) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.