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Finding the Third Proportional to 2,640 and 3,715

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Solution

The third proportional to 2,640 and 3,715 is: 5,227.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,640 : 3,715 = 3,715 : x
  2. Step 2: Convert to fraction form
    2,640/3,715 = 3,715/x
  3. Step 3: Cross multiply
    2,640x = 3,715 × 3,715
  4. Step 4: Simplify right side
    2,640x = 13,801,225
  5. Step 5: Solve for x
    x = 13,801,225/2,640
  6. Step 6: Final answer
    x = 5,227.74

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Why These Related Problems?

These problems maintain the same ratio (1.41) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.