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Finding the Third Proportional to 200,909 and 312,390

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Solution

The third proportional to 200,909 and 312,390 is: 485,729.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    200,909 : 312,390 = 312,390 : x
  2. Step 2: Convert to fraction form
    200,909/312,390 = 312,390/x
  3. Step 3: Cross multiply
    200,909x = 312,390 × 312,390
  4. Step 4: Simplify right side
    200,909x = 97,587,512,100
  5. Step 5: Solve for x
    x = 97,587,512,100/200,909
  6. Step 6: Final answer
    x = 485,729.92

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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.