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Finding the Fourth Proportional to 1,960.20, 2,940.28 and 864.56

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Solution

The fourth proportional to 1,960.20, 2,940.28 and 864.56 is: 1,296.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,960.20 : 2,940.28 = 864.56 : x
  2. Step 2: Convert to fraction form
    1,960.20/2,940.28 = 864.56/x
  3. Step 3: Cross multiply
    1,960.20x = 2,940.28 × 864.56
  4. Step 4: Simplify right side
    1,960.20x = 2,542,048.48
  5. Step 5: Solve for x
    x = 2,542,048.48/1,960.20
  6. Step 6: Final answer
    x = 1,296.83

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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.