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Finding the Fourth Proportional to 87,679.86, 131,487.42 and 31,504.86

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Solution

The fourth proportional to 87,679.86, 131,487.42 and 31,504.86 is: 47,245.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    87,679.86 : 131,487.42 = 31,504.86 : x
  2. Step 2: Convert to fraction form
    87,679.86/131,487.42 = 31,504.86/x
  3. Step 3: Cross multiply
    87,679.86x = 131,487.42 × 31,504.86
  4. Step 4: Simplify right side
    87,679.86x = 4,142,492,758.86
  5. Step 5: Solve for x
    x = 4,142,492,758.86/87,679.86
  6. Step 6: Final answer
    x = 47,245.66

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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.