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Finding the Fourth Proportional to 87,791.88, 131,686.44 and 21,231.56

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Solution

The fourth proportional to 87,791.88, 131,686.44 and 21,231.56 is: 31,847.01

Step by Step Solution

  1. Step 1: Write the proportion equation
    87,791.88 : 131,686.44 = 21,231.56 : x
  2. Step 2: Convert to fraction form
    87,791.88/131,686.44 = 21,231.56/x
  3. Step 3: Cross multiply
    87,791.88x = 131,686.44 × 21,231.56
  4. Step 4: Simplify right side
    87,791.88x = 2,795,908,552.05
  5. Step 5: Solve for x
    x = 2,795,908,552.05/87,791.88
  6. Step 6: Final answer
    x = 31,847.01

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.