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Finding the Fourth Proportional to 721,269.60, 995,346 and 398,976

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Solution

The fourth proportional to 721,269.60, 995,346 and 398,976 is: 550,583.53

Step by Step Solution

  1. Step 1: Write the proportion equation
    721,269.60 : 995,346 = 398,976 : x
  2. Step 2: Convert to fraction form
    721,269.60/995,346 = 398,976/x
  3. Step 3: Cross multiply
    721,269.60x = 995,346 × 398,976
  4. Step 4: Simplify right side
    721,269.60x = 397,119,165,696
  5. Step 5: Solve for x
    x = 397,119,165,696/721,269.60
  6. Step 6: Final answer
    x = 550,583.53

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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.