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Finding the Fourth Proportional to 685,481.20, 945,735.12 and 398,940.52

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Solution

The fourth proportional to 685,481.20, 945,735.12 and 398,940.52 is: 550,404.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    685,481.20 : 945,735.12 = 398,940.52 : x
  2. Step 2: Convert to fraction form
    685,481.20/945,735.12 = 398,940.52/x
  3. Step 3: Cross multiply
    685,481.20x = 945,735.12 × 398,940.52
  4. Step 4: Simplify right side
    685,481.20x = 377,292,060,555.06
  5. Step 5: Solve for x
    x = 377,292,060,555.06/685,481.20
  6. Step 6: Final answer
    x = 550,404.68

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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.