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Finding the Third Proportional to 2,128 and 2,916

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Solution

The third proportional to 2,128 and 2,916 is: 3,995.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,128 : 2,916 = 2,916 : x
  2. Step 2: Convert to fraction form
    2,128/2,916 = 2,916/x
  3. Step 3: Cross multiply
    2,128x = 2,916 × 2,916
  4. Step 4: Simplify right side
    2,128x = 8,503,056
  5. Step 5: Solve for x
    x = 8,503,056/2,128
  6. Step 6: Final answer
    x = 3,995.80

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Why These Related Problems?

These problems maintain the same ratio (1.37) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.