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Finding the Fourth Proportional to 1,960.12, 2,939.44 and 789.72

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Solution

The fourth proportional to 1,960.12, 2,939.44 and 789.72 is: 1,184.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,960.12 : 2,939.44 = 789.72 : x
  2. Step 2: Convert to fraction form
    1,960.12/2,939.44 = 789.72/x
  3. Step 3: Cross multiply
    1,960.12x = 2,939.44 × 789.72
  4. Step 4: Simplify right side
    1,960.12x = 2,321,347.84
  5. Step 5: Solve for x
    x = 2,321,347.84/1,960.12
  6. Step 6: Final answer
    x = 1,184.29

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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.