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Finding the Third Proportional to 3,979 and 7,391

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Solution

The third proportional to 3,979 and 7,391 is: 13,728.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,979 : 7,391 = 7,391 : x
  2. Step 2: Convert to fraction form
    3,979/7,391 = 7,391/x
  3. Step 3: Cross multiply
    3,979x = 7,391 × 7,391
  4. Step 4: Simplify right side
    3,979x = 54,626,881
  5. Step 5: Solve for x
    x = 54,626,881/3,979
  6. Step 6: Final answer
    x = 13,728.80

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Why These Related Problems?

These problems maintain the same ratio (1.86) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.