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Finding the Fourth Proportional to 87,874.20, 131,811.30 and 21,313.76

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Solution

The fourth proportional to 87,874.20, 131,811.30 and 21,313.76 is: 31,970.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    87,874.20 : 131,811.30 = 21,313.76 : x
  2. Step 2: Convert to fraction form
    87,874.20/131,811.30 = 21,313.76/x
  3. Step 3: Cross multiply
    87,874.20x = 131,811.30 × 21,313.76
  4. Step 4: Simplify right side
    87,874.20x = 2,809,393,754.43
  5. Step 5: Solve for x
    x = 2,809,393,754.43/87,874.20
  6. Step 6: Final answer
    x = 31,970.63

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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.