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Finding the Third Proportional to 256,190 and 409,269

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Solution

The third proportional to 256,190 and 409,269 is: 653,815.97

Step by Step Solution

  1. Step 1: Write the proportion equation
    256,190 : 409,269 = 409,269 : x
  2. Step 2: Convert to fraction form
    256,190/409,269 = 409,269/x
  3. Step 3: Cross multiply
    256,190x = 409,269 × 409,269
  4. Step 4: Simplify right side
    256,190x = 167,501,114,361
  5. Step 5: Solve for x
    x = 167,501,114,361/256,190
  6. Step 6: Final answer
    x = 653,815.97

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Why These Related Problems?

These problems maintain the same ratio (1.60) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.