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Finding the Fourth Proportional to 87,170.76, 120,149.46 and 66,745.80

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Solution

The fourth proportional to 87,170.76, 120,149.46 and 66,745.80 is: 91,997.27

Step by Step Solution

  1. Step 1: Write the proportion equation
    87,170.76 : 120,149.46 = 66,745.80 : x
  2. Step 2: Convert to fraction form
    87,170.76/120,149.46 = 66,745.80/x
  3. Step 3: Cross multiply
    87,170.76x = 120,149.46 × 66,745.80
  4. Step 4: Simplify right side
    87,170.76x = 8,019,471,827.27
  5. Step 5: Solve for x
    x = 8,019,471,827.27/87,170.76
  6. Step 6: Final answer
    x = 91,997.27

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.