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Finding the Fourth Proportional to 485,620.05, 728,305.81 and 143,983.59

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Solution

The fourth proportional to 485,620.05, 728,305.81 and 143,983.59 is: 215,938.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    485,620.05 : 728,305.81 = 143,983.59 : x
  2. Step 2: Convert to fraction form
    485,620.05/728,305.81 = 143,983.59/x
  3. Step 3: Cross multiply
    485,620.05x = 728,305.81 × 143,983.59
  4. Step 4: Simplify right side
    485,620.05x = 104,864,085,141.66
  5. Step 5: Solve for x
    x = 104,864,085,141.66/485,620.05
  6. Step 6: Final answer
    x = 215,938.54

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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.