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Finding the Third Proportional to 189,930 and 405,284

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Solution

The third proportional to 189,930 and 405,284 is: 864,819.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    189,930 : 405,284 = 405,284 : x
  2. Step 2: Convert to fraction form
    189,930/405,284 = 405,284/x
  3. Step 3: Cross multiply
    189,930x = 405,284 × 405,284
  4. Step 4: Simplify right side
    189,930x = 164,255,120,656
  5. Step 5: Solve for x
    x = 164,255,120,656/189,930
  6. Step 6: Final answer
    x = 864,819.25

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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.