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Finding the Fourth Proportional to 443,721.20, 665,128.20 and 218,735.60

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Solution

The fourth proportional to 443,721.20, 665,128.20 and 218,735.60 is: 327,879.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    443,721.20 : 665,128.20 = 218,735.60 : x
  2. Step 2: Convert to fraction form
    443,721.20/665,128.20 = 218,735.60/x
  3. Step 3: Cross multiply
    443,721.20x = 665,128.20 × 218,735.60
  4. Step 4: Simplify right side
    443,721.20x = 145,487,215,903.92
  5. Step 5: Solve for x
    x = 145,487,215,903.92/443,721.20
  6. Step 6: Final answer
    x = 327,879.79

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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.