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Finding the Fourth Proportional to 1,940.22, 2,908.31 and 769.91

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Solution

The fourth proportional to 1,940.22, 2,908.31 and 769.91 is: 1,154.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,940.22 : 2,908.31 = 769.91 : x
  2. Step 2: Convert to fraction form
    1,940.22/2,908.31 = 769.91/x
  3. Step 3: Cross multiply
    1,940.22x = 2,908.31 × 769.91
  4. Step 4: Simplify right side
    1,940.22x = 2,239,118.56
  5. Step 5: Solve for x
    x = 2,239,118.56/1,940.22
  6. Step 6: Final answer
    x = 1,154.05

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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.