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Finding the Third Proportional to 199,809 and 428,047

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Solution

The third proportional to 199,809 and 428,047 is: 916,996.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    199,809 : 428,047 = 428,047 : x
  2. Step 2: Convert to fraction form
    199,809/428,047 = 428,047/x
  3. Step 3: Cross multiply
    199,809x = 428,047 × 428,047
  4. Step 4: Simplify right side
    199,809x = 183,224,234,209
  5. Step 5: Solve for x
    x = 183,224,234,209/199,809
  6. Step 6: Final answer
    x = 916,996.90

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Why These Related Problems?

These problems maintain the same ratio (2.14) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.