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Finding the Third Proportional to 189,992 and 405,410

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Solution

The third proportional to 189,992 and 405,410 is: 865,074.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    189,992 : 405,410 = 405,410 : x
  2. Step 2: Convert to fraction form
    189,992/405,410 = 405,410/x
  3. Step 3: Cross multiply
    189,992x = 405,410 × 405,410
  4. Step 4: Simplify right side
    189,992x = 164,357,268,100
  5. Step 5: Solve for x
    x = 164,357,268,100/189,992
  6. Step 6: Final answer
    x = 865,074.68

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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.