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Finding the Third Proportional to 2,128 and 3,415

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Solution

The third proportional to 2,128 and 3,415 is: 5,480.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,128 : 3,415 = 3,415 : x
  2. Step 2: Convert to fraction form
    2,128/3,415 = 3,415/x
  3. Step 3: Cross multiply
    2,128x = 3,415 × 3,415
  4. Step 4: Simplify right side
    2,128x = 11,662,225
  5. Step 5: Solve for x
    x = 11,662,225/2,128
  6. Step 6: Final answer
    x = 5,480.37

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Why These Related Problems?

These problems maintain the same ratio (1.60) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.