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Finding the Fourth Proportional to 1,940.11, 2,908.54 and 769.38

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Solution

The fourth proportional to 1,940.11, 2,908.54 and 769.38 is: 1,153.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,940.11 : 2,908.54 = 769.38 : x
  2. Step 2: Convert to fraction form
    1,940.11/2,908.54 = 769.38/x
  3. Step 3: Cross multiply
    1,940.11x = 2,908.54 × 769.38
  4. Step 4: Simplify right side
    1,940.11x = 2,237,771.16
  5. Step 5: Solve for x
    x = 2,237,771.16/1,940.11
  6. Step 6: Final answer
    x = 1,153.43

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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.