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Finding the Third Proportional to 100,406 and 209,128

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Solution

The third proportional to 100,406 and 209,128 is: 435,576.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    100,406 : 209,128 = 209,128 : x
  2. Step 2: Convert to fraction form
    100,406/209,128 = 209,128/x
  3. Step 3: Cross multiply
    100,406x = 209,128 × 209,128
  4. Step 4: Simplify right side
    100,406x = 43,734,520,384
  5. Step 5: Solve for x
    x = 43,734,520,384/100,406
  6. Step 6: Final answer
    x = 435,576.76

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Why These Related Problems?

These problems maintain the same ratio (2.08) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.