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Finding the Third Proportional to 189,720 and 253,872

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Solution

The third proportional to 189,720 and 253,872 is: 339,716.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    189,720 : 253,872 = 253,872 : x
  2. Step 2: Convert to fraction form
    189,720/253,872 = 253,872/x
  3. Step 3: Cross multiply
    189,720x = 253,872 × 253,872
  4. Step 4: Simplify right side
    189,720x = 64,450,992,384
  5. Step 5: Solve for x
    x = 64,450,992,384/189,720
  6. Step 6: Final answer
    x = 339,716.38

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Why These Related Problems?

These problems maintain the same ratio (1.34) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.