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Finding the Third Proportional to 90,631 and 198,690

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Solution

The third proportional to 90,631 and 198,690 is: 435,587.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    90,631 : 198,690 = 198,690 : x
  2. Step 2: Convert to fraction form
    90,631/198,690 = 198,690/x
  3. Step 3: Cross multiply
    90,631x = 198,690 × 198,690
  4. Step 4: Simplify right side
    90,631x = 39,477,716,100
  5. Step 5: Solve for x
    x = 39,477,716,100/90,631
  6. Step 6: Final answer
    x = 435,587.34

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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.