Home / 1,286.46-1,918.62-1,161.90

Finding the Fourth Proportional to 1,286.46, 1,918.62 and 1,161.90

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Solution

The fourth proportional to 1,286.46, 1,918.62 and 1,161.90 is: 1,732.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,286.46 : 1,918.62 = 1,161.90 : x
  2. Step 2: Convert to fraction form
    1,286.46/1,918.62 = 1,161.90/x
  3. Step 3: Cross multiply
    1,286.46x = 1,918.62 × 1,161.90
  4. Step 4: Simplify right side
    1,286.46x = 2,229,244.58
  5. Step 5: Solve for x
    x = 2,229,244.58/1,286.46
  6. Step 6: Final answer
    x = 1,732.85

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.