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Finding the Third Proportional to 321,205 and 691,742

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Solution

The third proportional to 321,205 and 691,742 is: 1,489,724.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    321,205 : 691,742 = 691,742 : x
  2. Step 2: Convert to fraction form
    321,205/691,742 = 691,742/x
  3. Step 3: Cross multiply
    321,205x = 691,742 × 691,742
  4. Step 4: Simplify right side
    321,205x = 478,506,994,564
  5. Step 5: Solve for x
    x = 478,506,994,564/321,205
  6. Step 6: Final answer
    x = 1,489,724.61

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Why These Related Problems?

These problems maintain the same ratio (2.15) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.