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Finding the Third Proportional to 91,980 and 138,690

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Solution

The third proportional to 91,980 and 138,690 is: 209,120.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    91,980 : 138,690 = 138,690 : x
  2. Step 2: Convert to fraction form
    91,980/138,690 = 138,690/x
  3. Step 3: Cross multiply
    91,980x = 138,690 × 138,690
  4. Step 4: Simplify right side
    91,980x = 19,234,916,100
  5. Step 5: Solve for x
    x = 19,234,916,100/91,980
  6. Step 6: Final answer
    x = 209,120.64

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Why These Related Problems?

These problems maintain the same ratio (1.51) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.