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Finding the Third Proportional to 3,240 and 7,149

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Solution

The third proportional to 3,240 and 7,149 is: 15,774.14

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,240 : 7,149 = 7,149 : x
  2. Step 2: Convert to fraction form
    3,240/7,149 = 7,149/x
  3. Step 3: Cross multiply
    3,240x = 7,149 × 7,149
  4. Step 4: Simplify right side
    3,240x = 51,108,201
  5. Step 5: Solve for x
    x = 51,108,201/3,240
  6. Step 6: Final answer
    x = 15,774.14

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Why These Related Problems?

These problems maintain the same ratio (2.21) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.