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Finding the Fourth Proportional to 87,629.80, 122,915 and 87,629.80

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Solution

The fourth proportional to 87,629.80, 122,915 and 87,629.80 is: 122,915

Step by Step Solution

  1. Step 1: Write the proportion equation
    87,629.80 : 122,915 = 87,629.80 : x
  2. Step 2: Convert to fraction form
    87,629.80/122,915 = 87,629.80/x
  3. Step 3: Cross multiply
    87,629.80x = 122,915 × 87,629.80
  4. Step 4: Simplify right side
    87,629.80x = 10,771,016,867
  5. Step 5: Solve for x
    x = 10,771,016,867/87,629.80
  6. Step 6: Final answer
    x = 122,915

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Why These Related Problems?

These problems maintain the same ratio (1.40) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.