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Finding the Third Proportional to 66,751,990 and 138,619,939

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Solution

The third proportional to 66,751,990 and 138,619,939 is: 287,863,889.73

Step by Step Solution

  1. Step 1: Write the proportion equation
    66,751,990 : 138,619,939 = 138,619,939 : x
  2. Step 2: Convert to fraction form
    66,751,990/138,619,939 = 138,619,939/x
  3. Step 3: Cross multiply
    66,751,990x = 138,619,939 × 138,619,939
  4. Step 4: Simplify right side
    66,751,990x = 19,215,487,488,363,720
  5. Step 5: Solve for x
    x = 19,215,487,488,363,720/66,751,990
  6. Step 6: Final answer
    x = 287,863,889.73

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Why These Related Problems?

These problems maintain the same ratio (2.08) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.