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Finding the Fourth Proportional to 721,170, 995,095.80 and 398,817

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Solution

The fourth proportional to 721,170, 995,095.80 and 398,817 is: 550,301.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    721,170 : 995,095.80 = 398,817 : x
  2. Step 2: Convert to fraction form
    721,170/995,095.80 = 398,817/x
  3. Step 3: Cross multiply
    721,170x = 995,095.80 × 398,817
  4. Step 4: Simplify right side
    721,170x = 396,861,121,668.60
  5. Step 5: Solve for x
    x = 396,861,121,668.60/721,170
  6. Step 6: Final answer
    x = 550,301.76

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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.