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Finding the Fourth Proportional to 721,735.92, 995,964.95 and 399,415.86

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Solution

The fourth proportional to 721,735.92, 995,964.95 and 399,415.86 is: 551,176.94

Step by Step Solution

  1. Step 1: Write the proportion equation
    721,735.92 : 995,964.95 = 399,415.86 : x
  2. Step 2: Convert to fraction form
    721,735.92/995,964.95 = 399,415.86/x
  3. Step 3: Cross multiply
    721,735.92x = 995,964.95 × 399,415.86
  4. Step 4: Simplify right side
    721,735.92x = 397,804,195,037.03
  5. Step 5: Solve for x
    x = 397,804,195,037.03/721,735.92
  6. Step 6: Final answer
    x = 551,176.94

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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.