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Finding the Fourth Proportional to 131,212.80, 196,819.20 and 72,163.80

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Solution

The fourth proportional to 131,212.80, 196,819.20 and 72,163.80 is: 108,245.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    131,212.80 : 196,819.20 = 72,163.80 : x
  2. Step 2: Convert to fraction form
    131,212.80/196,819.20 = 72,163.80/x
  3. Step 3: Cross multiply
    131,212.80x = 196,819.20 × 72,163.80
  4. Step 4: Simplify right side
    131,212.80x = 14,203,221,384.96
  5. Step 5: Solve for x
    x = 14,203,221,384.96/131,212.80
  6. Step 6: Final answer
    x = 108,245.70

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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.