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Finding the Third Proportional to 39,615 and 79,878

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Solution

The third proportional to 39,615 and 79,878 is: 161,062.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    39,615 : 79,878 = 79,878 : x
  2. Step 2: Convert to fraction form
    39,615/79,878 = 79,878/x
  3. Step 3: Cross multiply
    39,615x = 79,878 × 79,878
  4. Step 4: Simplify right side
    39,615x = 6,380,494,884
  5. Step 5: Solve for x
    x = 6,380,494,884/39,615
  6. Step 6: Final answer
    x = 161,062.60

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Why These Related Problems?

These problems maintain the same ratio (2.02) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.