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Finding the Fourth Proportional to 667,367.48, 920,961.90 and 361,436.78

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Solution

The fourth proportional to 667,367.48, 920,961.90 and 361,436.78 is: 498,779.93

Step by Step Solution

  1. Step 1: Write the proportion equation
    667,367.48 : 920,961.90 = 361,436.78 : x
  2. Step 2: Convert to fraction form
    667,367.48/920,961.90 = 361,436.78/x
  3. Step 3: Cross multiply
    667,367.48x = 920,961.90 × 361,436.78
  4. Step 4: Simplify right side
    667,367.48x = 332,869,503,638.68
  5. Step 5: Solve for x
    x = 332,869,503,638.68/667,367.48
  6. Step 6: Final answer
    x = 498,779.93

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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.