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Finding the Fourth Proportional to 721,267.80, 995,308.20 and 394,515.96

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Solution

The fourth proportional to 721,267.80, 995,308.20 and 394,515.96 is: 544,409.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    721,267.80 : 995,308.20 = 394,515.96 : x
  2. Step 2: Convert to fraction form
    721,267.80/995,308.20 = 394,515.96/x
  3. Step 3: Cross multiply
    721,267.80x = 995,308.20 × 394,515.96
  4. Step 4: Simplify right side
    721,267.80x = 392,664,970,018.87
  5. Step 5: Solve for x
    x = 392,664,970,018.87/721,267.80
  6. Step 6: Final answer
    x = 544,409.40

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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.