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Finding the Third Proportional to 412,921.13 and 638,200.69

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Solution

The third proportional to 412,921.13 and 638,200.69 is: 986,387.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    412,921.13 : 638,200.69 = 638,200.69 : x
  2. Step 2: Convert to fraction form
    412,921.13/638,200.69 = 638,200.69/x
  3. Step 3: Cross multiply
    412,921.13x = 638,200.69 × 638,200.69
  4. Step 4: Simplify right side
    412,921.13x = 407,300,117,525.47
  5. Step 5: Solve for x
    x = 407,300,117,525.47/412,921.13
  6. Step 6: Final answer
    x = 986,387.21

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Why These Related Problems?

These problems maintain the same ratio (1.55) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.