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Finding the Third Proportional to 6,388 and 7,009

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Solution

The third proportional to 6,388 and 7,009 is: 7,690.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    6,388 : 7,009 = 7,009 : x
  2. Step 2: Convert to fraction form
    6,388/7,009 = 7,009/x
  3. Step 3: Cross multiply
    6,388x = 7,009 × 7,009
  4. Step 4: Simplify right side
    6,388x = 49,126,081
  5. Step 5: Solve for x
    x = 49,126,081/6,388
  6. Step 6: Final answer
    x = 7,690.37

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Why These Related Problems?

These problems maintain the same ratio (1.10) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.