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Finding the Third Proportional to 74,990 and 108,975

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Solution

The third proportional to 74,990 and 108,975 is: 158,361.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    74,990 : 108,975 = 108,975 : x
  2. Step 2: Convert to fraction form
    74,990/108,975 = 108,975/x
  3. Step 3: Cross multiply
    74,990x = 108,975 × 108,975
  4. Step 4: Simplify right side
    74,990x = 11,875,550,625
  5. Step 5: Solve for x
    x = 11,875,550,625/74,990
  6. Step 6: Final answer
    x = 158,361.79

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Why These Related Problems?

These problems maintain the same ratio (1.45) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.