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Finding the Fourth Proportional to 485,628.48, 728,540.64 and 205,145.28

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Solution

The fourth proportional to 485,628.48, 728,540.64 and 205,145.28 is: 307,759.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    485,628.48 : 728,540.64 = 205,145.28 : x
  2. Step 2: Convert to fraction form
    485,628.48/728,540.64 = 205,145.28/x
  3. Step 3: Cross multiply
    485,628.48x = 728,540.64 × 205,145.28
  4. Step 4: Simplify right side
    485,628.48x = 149,456,673,584.18
  5. Step 5: Solve for x
    x = 149,456,673,584.18/485,628.48
  6. Step 6: Final answer
    x = 307,759.28

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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.