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Finding the Fourth Proportional to 221,278.40, 331,879.20 and 80,964.80

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Solution

The fourth proportional to 221,278.40, 331,879.20 and 80,964.80 is: 121,433.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    221,278.40 : 331,879.20 = 80,964.80 : x
  2. Step 2: Convert to fraction form
    221,278.40/331,879.20 = 80,964.80/x
  3. Step 3: Cross multiply
    221,278.40x = 331,879.20 × 80,964.80
  4. Step 4: Simplify right side
    221,278.40x = 26,870,533,052.16
  5. Step 5: Solve for x
    x = 26,870,533,052.16/221,278.40
  6. Step 6: Final answer
    x = 121,433.15

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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.