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Finding the Fourth Proportional to 1,959.91, 2,939.11 and 789.51

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Solution

The fourth proportional to 1,959.91, 2,939.11 and 789.51 is: 1,183.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,959.91 : 2,939.11 = 789.51 : x
  2. Step 2: Convert to fraction form
    1,959.91/2,939.11 = 789.51/x
  3. Step 3: Cross multiply
    1,959.91x = 2,939.11 × 789.51
  4. Step 4: Simplify right side
    1,959.91x = 2,320,456.74
  5. Step 5: Solve for x
    x = 2,320,456.74/1,959.91
  6. Step 6: Final answer
    x = 1,183.96

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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.