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Finding the Fourth Proportional to 721,682.20, 995,896.86 and 399,405.88

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Solution

The fourth proportional to 721,682.20, 995,896.86 and 399,405.88 is: 551,166.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    721,682.20 : 995,896.86 = 399,405.88 : x
  2. Step 2: Convert to fraction form
    721,682.20/995,896.86 = 399,405.88/x
  3. Step 3: Cross multiply
    721,682.20x = 995,896.86 × 399,405.88
  4. Step 4: Simplify right side
    721,682.20x = 397,767,061,757.54
  5. Step 5: Solve for x
    x = 397,767,061,757.54/721,682.20
  6. Step 6: Final answer
    x = 551,166.51

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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.