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Finding the Third Proportional to 2,781 and 3,240

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Solution

The third proportional to 2,781 and 3,240 is: 3,774.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,781 : 3,240 = 3,240 : x
  2. Step 2: Convert to fraction form
    2,781/3,240 = 3,240/x
  3. Step 3: Cross multiply
    2,781x = 3,240 × 3,240
  4. Step 4: Simplify right side
    2,781x = 10,497,600
  5. Step 5: Solve for x
    x = 10,497,600/2,781
  6. Step 6: Final answer
    x = 3,774.76

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Why These Related Problems?

These problems maintain the same ratio (1.17) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.