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Finding the Fourth Proportional to 1,959.13, 2,939.87 and 863.47

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Solution

The fourth proportional to 1,959.13, 2,939.87 and 863.47 is: 1,295.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,959.13 : 2,939.87 = 863.47 : x
  2. Step 2: Convert to fraction form
    1,959.13/2,939.87 = 863.47/x
  3. Step 3: Cross multiply
    1,959.13x = 2,939.87 × 863.47
  4. Step 4: Simplify right side
    1,959.13x = 2,538,489.55
  5. Step 5: Solve for x
    x = 2,538,489.55/1,959.13
  6. Step 6: Final answer
    x = 1,295.72

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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.