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Finding the Third Proportional to 318,331 and 689,150

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Solution

The third proportional to 318,331 and 689,150 is: 1,491,930.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    318,331 : 689,150 = 689,150 : x
  2. Step 2: Convert to fraction form
    318,331/689,150 = 689,150/x
  3. Step 3: Cross multiply
    318,331x = 689,150 × 689,150
  4. Step 4: Simplify right side
    318,331x = 474,927,722,500
  5. Step 5: Solve for x
    x = 474,927,722,500/318,331
  6. Step 6: Final answer
    x = 1,491,930.48

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Why These Related Problems?

These problems maintain the same ratio (2.16) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.