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Finding the Fourth Proportional to 721,067.64, 995,104.44 and 398,777.82

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Solution

The fourth proportional to 721,067.64, 995,104.44 and 398,777.82 is: 550,330.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    721,067.64 : 995,104.44 = 398,777.82 : x
  2. Step 2: Convert to fraction form
    721,067.64/995,104.44 = 398,777.82/x
  3. Step 3: Cross multiply
    721,067.64x = 995,104.44 × 398,777.82
  4. Step 4: Simplify right side
    721,067.64x = 396,825,579,255.52
  5. Step 5: Solve for x
    x = 396,825,579,255.52/721,067.64
  6. Step 6: Final answer
    x = 550,330.59

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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.