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Finding the Fourth Proportional to 398,759.28, 550,272.60 and 219,911.28

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Solution

The fourth proportional to 398,759.28, 550,272.60 and 219,911.28 is: 303,469.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    398,759.28 : 550,272.60 = 219,911.28 : x
  2. Step 2: Convert to fraction form
    398,759.28/550,272.60 = 219,911.28/x
  3. Step 3: Cross multiply
    398,759.28x = 550,272.60 × 219,911.28
  4. Step 4: Simplify right side
    398,759.28x = 121,011,151,814.93
  5. Step 5: Solve for x
    x = 121,011,151,814.93/398,759.28
  6. Step 6: Final answer
    x = 303,469.18

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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.