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Finding the Third Proportional to 198,555 and 428,212

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Solution

The third proportional to 198,555 and 428,212 is: 923,499.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    198,555 : 428,212 = 428,212 : x
  2. Step 2: Convert to fraction form
    198,555/428,212 = 428,212/x
  3. Step 3: Cross multiply
    198,555x = 428,212 × 428,212
  4. Step 4: Simplify right side
    198,555x = 183,365,516,944
  5. Step 5: Solve for x
    x = 183,365,516,944/198,555
  6. Step 6: Final answer
    x = 923,499.87

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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.