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Finding the Third Proportional to 313,605 and 689,637

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Solution

The third proportional to 313,605 and 689,637 is: 1,516,554.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    313,605 : 689,637 = 689,637 : x
  2. Step 2: Convert to fraction form
    313,605/689,637 = 689,637/x
  3. Step 3: Cross multiply
    313,605x = 689,637 × 689,637
  4. Step 4: Simplify right side
    313,605x = 475,599,191,769
  5. Step 5: Solve for x
    x = 475,599,191,769/313,605
  6. Step 6: Final answer
    x = 1,516,554.88

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Why These Related Problems?

These problems maintain the same ratio (2.20) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.