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Finding the Third Proportional to 5,409 and 8,172

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Solution

The third proportional to 5,409 and 8,172 is: 12,346.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    5,409 : 8,172 = 8,172 : x
  2. Step 2: Convert to fraction form
    5,409/8,172 = 8,172/x
  3. Step 3: Cross multiply
    5,409x = 8,172 × 8,172
  4. Step 4: Simplify right side
    5,409x = 66,781,584
  5. Step 5: Solve for x
    x = 66,781,584/5,409
  6. Step 6: Final answer
    x = 12,346.38

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Why These Related Problems?

These problems maintain the same ratio (1.51) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.