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Finding the Third Proportional to 321,920 and 685,420

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Solution

The third proportional to 321,920 and 685,420 is: 1,459,370.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    321,920 : 685,420 = 685,420 : x
  2. Step 2: Convert to fraction form
    321,920/685,420 = 685,420/x
  3. Step 3: Cross multiply
    321,920x = 685,420 × 685,420
  4. Step 4: Simplify right side
    321,920x = 469,800,576,400
  5. Step 5: Solve for x
    x = 469,800,576,400/321,920
  6. Step 6: Final answer
    x = 1,459,370.58

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Why These Related Problems?

These problems maintain the same ratio (2.13) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.