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Finding the Fourth Proportional to 721,187.81, 995,172.26 and 398,891.00

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Solution

The fourth proportional to 721,187.81, 995,172.26 and 398,891.00 is: 550,432.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    721,187.81 : 995,172.26 = 398,891.00 : x
  2. Step 2: Convert to fraction form
    721,187.81/995,172.26 = 398,891.00/x
  3. Step 3: Cross multiply
    721,187.81x = 995,172.26 × 398,891.00
  4. Step 4: Simplify right side
    721,187.81x = 396,965,250,993.34
  5. Step 5: Solve for x
    x = 396,965,250,993.34/721,187.81
  6. Step 6: Final answer
    x = 550,432.56

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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.