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Finding the Third Proportional to 4,979 and 7,739

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Solution

The third proportional to 4,979 and 7,739 is: 12,028.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    4,979 : 7,739 = 7,739 : x
  2. Step 2: Convert to fraction form
    4,979/7,739 = 7,739/x
  3. Step 3: Cross multiply
    4,979x = 7,739 × 7,739
  4. Step 4: Simplify right side
    4,979x = 59,892,121
  5. Step 5: Solve for x
    x = 59,892,121/4,979
  6. Step 6: Final answer
    x = 12,028.95

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Why These Related Problems?

These problems maintain the same ratio (1.55) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.