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Finding the Fourth Proportional to 721,659.20, 995,865.12 and 399,382.88

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Solution

The fourth proportional to 721,659.20, 995,865.12 and 399,382.88 is: 551,134.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    721,659.20 : 995,865.12 = 399,382.88 : x
  2. Step 2: Convert to fraction form
    721,659.20/995,865.12 = 399,382.88/x
  3. Step 3: Cross multiply
    721,659.20x = 995,865.12 × 399,382.88
  4. Step 4: Simplify right side
    721,659.20x = 397,731,479,717.15
  5. Step 5: Solve for x
    x = 397,731,479,717.15/721,659.20
  6. Step 6: Final answer
    x = 551,134.77

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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.