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Finding the Fourth Proportional to 485,979.39, 728,378.09 and 343,865.61

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Solution

The fourth proportional to 485,979.39, 728,378.09 and 343,865.61 is: 515,380.24

Step by Step Solution

  1. Step 1: Write the proportion equation
    485,979.39 : 728,378.09 = 343,865.61 : x
  2. Step 2: Convert to fraction form
    485,979.39/728,378.09 = 343,865.61/x
  3. Step 3: Cross multiply
    485,979.39x = 728,378.09 × 343,865.61
  4. Step 4: Simplify right side
    485,979.39x = 250,464,174,509.16
  5. Step 5: Solve for x
    x = 250,464,174,509.16/485,979.39
  6. Step 6: Final answer
    x = 515,380.24

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.