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Finding the Fourth Proportional to 721,081.31, 995,051.74 and 394,329.31

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Solution

The fourth proportional to 721,081.31, 995,051.74 and 394,329.31 is: 544,152.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    721,081.31 : 995,051.74 = 394,329.31 : x
  2. Step 2: Convert to fraction form
    721,081.31/995,051.74 = 394,329.31/x
  3. Step 3: Cross multiply
    721,081.31x = 995,051.74 × 394,329.31
  4. Step 4: Simplify right side
    721,081.31x = 392,378,068,911.58
  5. Step 5: Solve for x
    x = 392,378,068,911.58/721,081.31
  6. Step 6: Final answer
    x = 544,152.32

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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.