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Finding the Third Proportional to 200,580 and 280,390

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Solution

The third proportional to 200,580 and 280,390 is: 391,956.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    200,580 : 280,390 = 280,390 : x
  2. Step 2: Convert to fraction form
    200,580/280,390 = 280,390/x
  3. Step 3: Cross multiply
    200,580x = 280,390 × 280,390
  4. Step 4: Simplify right side
    200,580x = 78,618,552,100
  5. Step 5: Solve for x
    x = 78,618,552,100/200,580
  6. Step 6: Final answer
    x = 391,956.09

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Why These Related Problems?

These problems maintain the same ratio (1.40) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.