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Finding the Fourth Proportional to 721,640.39, 995,865.68 and 399,372.71

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Solution

The fourth proportional to 721,640.39, 995,865.68 and 399,372.71 is: 551,135.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    721,640.39 : 995,865.68 = 399,372.71 : x
  2. Step 2: Convert to fraction form
    721,640.39/995,865.68 = 399,372.71/x
  3. Step 3: Cross multiply
    721,640.39x = 995,865.68 × 399,372.71
  4. Step 4: Simplify right side
    721,640.39x = 397,721,573,420.73
  5. Step 5: Solve for x
    x = 397,721,573,420.73/721,640.39
  6. Step 6: Final answer
    x = 551,135.41

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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.