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Finding the Fourth Proportional to 2,405.78, 3,608.81 and 674.54

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Solution

The fourth proportional to 2,405.78, 3,608.81 and 674.54 is: 1,011.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,405.78 : 3,608.81 = 674.54 : x
  2. Step 2: Convert to fraction form
    2,405.78/3,608.81 = 674.54/x
  3. Step 3: Cross multiply
    2,405.78x = 3,608.81 × 674.54
  4. Step 4: Simplify right side
    2,405.78x = 2,434,286.70
  5. Step 5: Solve for x
    x = 2,434,286.70/2,405.78
  6. Step 6: Final answer
    x = 1,011.85

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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.