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Finding the Fourth Proportional to 1,361.10, 2,040.78 and 581.61

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Solution

The fourth proportional to 1,361.10, 2,040.78 and 581.61 is: 872.04

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,361.10 : 2,040.78 = 581.61 : x
  2. Step 2: Convert to fraction form
    1,361.10/2,040.78 = 581.61/x
  3. Step 3: Cross multiply
    1,361.10x = 2,040.78 × 581.61
  4. Step 4: Simplify right side
    1,361.10x = 1,186,940.98
  5. Step 5: Solve for x
    x = 1,186,940.98/1,361.10
  6. Step 6: Final answer
    x = 872.04

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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.