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Finding the Fourth Proportional to 87,121.80, 120,245.76 and 56,912.04

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Solution

The fourth proportional to 87,121.80, 120,245.76 and 56,912.04 is: 78,550.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    87,121.80 : 120,245.76 = 56,912.04 : x
  2. Step 2: Convert to fraction form
    87,121.80/120,245.76 = 56,912.04/x
  3. Step 3: Cross multiply
    87,121.80x = 120,245.76 × 56,912.04
  4. Step 4: Simplify right side
    87,121.80x = 6,843,431,502.95
  5. Step 5: Solve for x
    x = 6,843,431,502.95/87,121.80
  6. Step 6: Final answer
    x = 78,550.16

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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.