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Finding the Third Proportional to 275,535 and 421,206

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Solution

The third proportional to 275,535 and 421,206 is: 643,890.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    275,535 : 421,206 = 421,206 : x
  2. Step 2: Convert to fraction form
    275,535/421,206 = 421,206/x
  3. Step 3: Cross multiply
    275,535x = 421,206 × 421,206
  4. Step 4: Simplify right side
    275,535x = 177,414,494,436
  5. Step 5: Solve for x
    x = 177,414,494,436/275,535
  6. Step 6: Final answer
    x = 643,890.96

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Why These Related Problems?

These problems maintain the same ratio (1.53) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.