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Finding the Third Proportional to 6,921 and 10,509

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Solution

The third proportional to 6,921 and 10,509 is: 15,957.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    6,921 : 10,509 = 10,509 : x
  2. Step 2: Convert to fraction form
    6,921/10,509 = 10,509/x
  3. Step 3: Cross multiply
    6,921x = 10,509 × 10,509
  4. Step 4: Simplify right side
    6,921x = 110,439,081
  5. Step 5: Solve for x
    x = 110,439,081/6,921
  6. Step 6: Final answer
    x = 15,957.10

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Why These Related Problems?

These problems maintain the same ratio (1.52) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.