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Finding the Third Proportional to 3,128 and 5,172

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Solution

The third proportional to 3,128 and 5,172 is: 8,551.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,128 : 5,172 = 5,172 : x
  2. Step 2: Convert to fraction form
    3,128/5,172 = 5,172/x
  3. Step 3: Cross multiply
    3,128x = 5,172 × 5,172
  4. Step 4: Simplify right side
    3,128x = 26,749,584
  5. Step 5: Solve for x
    x = 26,749,584/3,128
  6. Step 6: Final answer
    x = 8,551.66

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Why These Related Problems?

These problems maintain the same ratio (1.65) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.