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Finding the Third Proportional to 6,515 and 7,121

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Solution

The third proportional to 6,515 and 7,121 is: 7,783.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    6,515 : 7,121 = 7,121 : x
  2. Step 2: Convert to fraction form
    6,515/7,121 = 7,121/x
  3. Step 3: Cross multiply
    6,515x = 7,121 × 7,121
  4. Step 4: Simplify right side
    6,515x = 50,708,641
  5. Step 5: Solve for x
    x = 50,708,641/6,515
  6. Step 6: Final answer
    x = 7,783.37

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Why These Related Problems?

These problems maintain the same ratio (1.09) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.