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Finding the Fourth Proportional to 398,761.28, 550,275.36 and 219,913.28

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Solution

The fourth proportional to 398,761.28, 550,275.36 and 219,913.28 is: 303,471.94

Step by Step Solution

  1. Step 1: Write the proportion equation
    398,761.28 : 550,275.36 = 219,913.28 : x
  2. Step 2: Convert to fraction form
    398,761.28/550,275.36 = 219,913.28/x
  3. Step 3: Cross multiply
    398,761.28x = 550,275.36 × 219,913.28
  4. Step 4: Simplify right side
    398,761.28x = 121,012,859,320.78
  5. Step 5: Solve for x
    x = 121,012,859,320.78/398,761.28
  6. Step 6: Final answer
    x = 303,471.94

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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.