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Finding the Fourth Proportional to 919.97, 1,379.92 and 226.61

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Solution

The fourth proportional to 919.97, 1,379.92 and 226.61 is: 339.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    919.97 : 1,379.92 = 226.61 : x
  2. Step 2: Convert to fraction form
    919.97/1,379.92 = 226.61/x
  3. Step 3: Cross multiply
    919.97x = 1,379.92 × 226.61
  4. Step 4: Simplify right side
    919.97x = 312,695.64
  5. Step 5: Solve for x
    x = 312,695.64/919.97
  6. Step 6: Final answer
    x = 339.90

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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.