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Finding the Third Proportional to 311,128 and 682,520

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Solution

The third proportional to 311,128 and 682,520 is: 1,497,240.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    311,128 : 682,520 = 682,520 : x
  2. Step 2: Convert to fraction form
    311,128/682,520 = 682,520/x
  3. Step 3: Cross multiply
    311,128x = 682,520 × 682,520
  4. Step 4: Simplify right side
    311,128x = 465,833,550,400
  5. Step 5: Solve for x
    x = 465,833,550,400/311,128
  6. Step 6: Final answer
    x = 1,497,240.85

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Why These Related Problems?

These problems maintain the same ratio (2.19) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.