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Finding the Fourth Proportional to 3,129.87, 4,694.71 and 789.87

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Solution

The fourth proportional to 3,129.87, 4,694.71 and 789.87 is: 1,184.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,129.87 : 4,694.71 = 789.87 : x
  2. Step 2: Convert to fraction form
    3,129.87/4,694.71 = 789.87/x
  3. Step 3: Cross multiply
    3,129.87x = 4,694.71 × 789.87
  4. Step 4: Simplify right side
    3,129.87x = 3,708,210.59
  5. Step 5: Solve for x
    x = 3,708,210.59/3,129.87
  6. Step 6: Final answer
    x = 1,184.78

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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.