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Finding the Fourth Proportional to 641,919.60, 962,620.20 and 220,978.80

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Solution

The fourth proportional to 641,919.60, 962,620.20 and 220,978.80 is: 331,378.97

Step by Step Solution

  1. Step 1: Write the proportion equation
    641,919.60 : 962,620.20 = 220,978.80 : x
  2. Step 2: Convert to fraction form
    641,919.60/962,620.20 = 220,978.80/x
  3. Step 3: Cross multiply
    641,919.60x = 962,620.20 × 220,978.80
  4. Step 4: Simplify right side
    641,919.60x = 212,718,656,651.76
  5. Step 5: Solve for x
    x = 212,718,656,651.76/641,919.60
  6. Step 6: Final answer
    x = 331,378.97

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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.