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Finding the Third Proportional to 86,205 and 189,690

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Solution

The third proportional to 86,205 and 189,690 is: 417,403.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    86,205 : 189,690 = 189,690 : x
  2. Step 2: Convert to fraction form
    86,205/189,690 = 189,690/x
  3. Step 3: Cross multiply
    86,205x = 189,690 × 189,690
  4. Step 4: Simplify right side
    86,205x = 35,982,296,100
  5. Step 5: Solve for x
    x = 35,982,296,100/86,205
  6. Step 6: Final answer
    x = 417,403.82

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Why These Related Problems?

These problems maintain the same ratio (2.20) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.