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Finding the Fourth Proportional to 2,489.11, 3,734.39 and 757.69

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Solution

The fourth proportional to 2,489.11, 3,734.39 and 757.69 is: 1,136.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,489.11 : 3,734.39 = 757.69 : x
  2. Step 2: Convert to fraction form
    2,489.11/3,734.39 = 757.69/x
  3. Step 3: Cross multiply
    2,489.11x = 3,734.39 × 757.69
  4. Step 4: Simplify right side
    2,489.11x = 2,829,506.17
  5. Step 5: Solve for x
    x = 2,829,506.17/2,489.11
  6. Step 6: Final answer
    x = 1,136.75

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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.