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Finding the Fourth Proportional to 721,376.64, 995,478.12 and 399,067.92

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Solution

The fourth proportional to 721,376.64, 995,478.12 and 399,067.92 is: 550,701.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    721,376.64 : 995,478.12 = 399,067.92 : x
  2. Step 2: Convert to fraction form
    721,376.64/995,478.12 = 399,067.92/x
  3. Step 3: Cross multiply
    721,376.64x = 995,478.12 × 399,067.92
  4. Step 4: Simplify right side
    721,376.64x = 397,263,382,753.91
  5. Step 5: Solve for x
    x = 397,263,382,753.91/721,376.64
  6. Step 6: Final answer
    x = 550,701.76

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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.