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Finding the Third Proportional to 1,978 and 2,817

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Solution

The third proportional to 1,978 and 2,817 is: 4,011.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,978 : 2,817 = 2,817 : x
  2. Step 2: Convert to fraction form
    1,978/2,817 = 2,817/x
  3. Step 3: Cross multiply
    1,978x = 2,817 × 2,817
  4. Step 4: Simplify right side
    1,978x = 7,935,489
  5. Step 5: Solve for x
    x = 7,935,489/1,978
  6. Step 6: Final answer
    x = 4,011.88

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Why These Related Problems?

These problems maintain the same ratio (1.42) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.