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Finding the Fourth Proportional to 1,361.64, 2,042.68 and 581.65

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Solution

The fourth proportional to 1,361.64, 2,042.68 and 581.65 is: 872.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,361.64 : 2,042.68 = 581.65 : x
  2. Step 2: Convert to fraction form
    1,361.64/2,042.68 = 581.65/x
  3. Step 3: Cross multiply
    1,361.64x = 2,042.68 × 581.65
  4. Step 4: Simplify right side
    1,361.64x = 1,188,120.44
  5. Step 5: Solve for x
    x = 1,188,120.44/1,361.64
  6. Step 6: Final answer
    x = 872.56

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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.