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Finding the Third Proportional to 179,980 and 393,860

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Solution

The third proportional to 179,980 and 393,860 is: 861,905.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    179,980 : 393,860 = 393,860 : x
  2. Step 2: Convert to fraction form
    179,980/393,860 = 393,860/x
  3. Step 3: Cross multiply
    179,980x = 393,860 × 393,860
  4. Step 4: Simplify right side
    179,980x = 155,125,699,600
  5. Step 5: Solve for x
    x = 155,125,699,600/179,980
  6. Step 6: Final answer
    x = 861,905.21

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Why These Related Problems?

These problems maintain the same ratio (2.19) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.