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Finding the Fourth Proportional to 667,238.45, 920,790.92 and 361,318.43

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Solution

The fourth proportional to 667,238.45, 920,790.92 and 361,318.43 is: 498,620.44

Step by Step Solution

  1. Step 1: Write the proportion equation
    667,238.45 : 920,790.92 = 361,318.43 : x
  2. Step 2: Convert to fraction form
    667,238.45/920,790.92 = 361,318.43/x
  3. Step 3: Cross multiply
    667,238.45x = 920,790.92 × 361,318.43
  4. Step 4: Simplify right side
    667,238.45x = 332,698,729,572.66
  5. Step 5: Solve for x
    x = 332,698,729,572.66/667,238.45
  6. Step 6: Final answer
    x = 498,620.44

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.