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Finding the Fourth Proportional to 2,105.75, 3,158.63 and 789.45

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Solution

The fourth proportional to 2,105.75, 3,158.63 and 789.45 is: 1,184.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,105.75 : 3,158.63 = 789.45 : x
  2. Step 2: Convert to fraction form
    2,105.75/3,158.63 = 789.45/x
  3. Step 3: Cross multiply
    2,105.75x = 3,158.63 × 789.45
  4. Step 4: Simplify right side
    2,105.75x = 2,493,576.51
  5. Step 5: Solve for x
    x = 2,493,576.51/2,105.75
  6. Step 6: Final answer
    x = 1,184.18

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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.