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Finding the Third Proportional to 4,978 and 7,922

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Solution

The third proportional to 4,978 and 7,922 is: 12,607.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    4,978 : 7,922 = 7,922 : x
  2. Step 2: Convert to fraction form
    4,978/7,922 = 7,922/x
  3. Step 3: Cross multiply
    4,978x = 7,922 × 7,922
  4. Step 4: Simplify right side
    4,978x = 62,758,084
  5. Step 5: Solve for x
    x = 62,758,084/4,978
  6. Step 6: Final answer
    x = 12,607.09

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Why These Related Problems?

These problems maintain the same ratio (1.59) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.