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Finding the Third Proportional to 3,600 and 6,390

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Solution

The third proportional to 3,600 and 6,390 is: 11,342.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,600 : 6,390 = 6,390 : x
  2. Step 2: Convert to fraction form
    3,600/6,390 = 6,390/x
  3. Step 3: Cross multiply
    3,600x = 6,390 × 6,390
  4. Step 4: Simplify right side
    3,600x = 40,832,100
  5. Step 5: Solve for x
    x = 40,832,100/3,600
  6. Step 6: Final answer
    x = 11,342.25

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Why These Related Problems?

These problems maintain the same ratio (1.78) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.