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Finding the Third Proportional to 196,886 and 421,780

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Solution

The third proportional to 196,886 and 421,780 is: 903,560.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    196,886 : 421,780 = 421,780 : x
  2. Step 2: Convert to fraction form
    196,886/421,780 = 421,780/x
  3. Step 3: Cross multiply
    196,886x = 421,780 × 421,780
  4. Step 4: Simplify right side
    196,886x = 177,898,368,400
  5. Step 5: Solve for x
    x = 177,898,368,400/196,886
  6. Step 6: Final answer
    x = 903,560.28

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Why These Related Problems?

These problems maintain the same ratio (2.14) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.