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Finding the Fourth Proportional to 485,929.60, 728,635.20 and 205,129.60

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Solution

The fourth proportional to 485,929.60, 728,635.20 and 205,129.60 is: 307,584.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    485,929.60 : 728,635.20 = 205,129.60 : x
  2. Step 2: Convert to fraction form
    485,929.60/728,635.20 = 205,129.60/x
  3. Step 3: Cross multiply
    485,929.60x = 728,635.20 × 205,129.60
  4. Step 4: Simplify right side
    485,929.60x = 149,464,647,121.92
  5. Step 5: Solve for x
    x = 149,464,647,121.92/485,929.60
  6. Step 6: Final answer
    x = 307,584.98

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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.