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Finding the Fourth Proportional to 2,080.97, 3,121.80 and 694.65

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Solution

The fourth proportional to 2,080.97, 3,121.80 and 694.65 is: 1,042.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,080.97 : 3,121.80 = 694.65 : x
  2. Step 2: Convert to fraction form
    2,080.97/3,121.80 = 694.65/x
  3. Step 3: Cross multiply
    2,080.97x = 3,121.80 × 694.65
  4. Step 4: Simplify right side
    2,080.97x = 2,168,558.37
  5. Step 5: Solve for x
    x = 2,168,558.37/2,080.97
  6. Step 6: Final answer
    x = 1,042.09

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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.