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Finding the Fourth Proportional to 398,843.28, 550,365.48 and 219,983.76

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Solution

The fourth proportional to 398,843.28, 550,365.48 and 219,983.76 is: 303,556.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    398,843.28 : 550,365.48 = 219,983.76 : x
  2. Step 2: Convert to fraction form
    398,843.28/550,365.48 = 219,983.76/x
  3. Step 3: Cross multiply
    398,843.28x = 550,365.48 × 219,983.76
  4. Step 4: Simplify right side
    398,843.28x = 121,071,467,664.61
  5. Step 5: Solve for x
    x = 121,071,467,664.61/398,843.28
  6. Step 6: Final answer
    x = 303,556.49

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1.5x scale

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.