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Finding the Third Proportional to 6,918 and 7,990

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Solution

The third proportional to 6,918 and 7,990 is: 9,228.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    6,918 : 7,990 = 7,990 : x
  2. Step 2: Convert to fraction form
    6,918/7,990 = 7,990/x
  3. Step 3: Cross multiply
    6,918x = 7,990 × 7,990
  4. Step 4: Simplify right side
    6,918x = 63,840,100
  5. Step 5: Solve for x
    x = 63,840,100/6,918
  6. Step 6: Final answer
    x = 9,228.12

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Why These Related Problems?

These problems maintain the same ratio (1.15) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.