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Finding the Fourth Proportional to 485,979.45, 728,378.17 and 343,865.68

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Solution

The fourth proportional to 485,979.45, 728,378.17 and 343,865.68 is: 515,380.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    485,979.45 : 728,378.17 = 343,865.68 : x
  2. Step 2: Convert to fraction form
    485,979.45/728,378.17 = 343,865.68/x
  3. Step 3: Cross multiply
    485,979.45x = 728,378.17 × 343,865.68
  4. Step 4: Simplify right side
    485,979.45x = 250,464,254,724.21
  5. Step 5: Solve for x
    x = 250,464,254,724.21/485,979.45
  6. Step 6: Final answer
    x = 515,380.34

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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.