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Finding the Fourth Proportional to 1,940.80, 2,911.24 and 786.56

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Solution

The fourth proportional to 1,940.80, 2,911.24 and 786.56 is: 1,179.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,940.80 : 2,911.24 = 786.56 : x
  2. Step 2: Convert to fraction form
    1,940.80/2,911.24 = 786.56/x
  3. Step 3: Cross multiply
    1,940.80x = 2,911.24 × 786.56
  4. Step 4: Simplify right side
    1,940.80x = 2,289,864.93
  5. Step 5: Solve for x
    x = 2,289,864.93/1,940.80
  6. Step 6: Final answer
    x = 1,179.86

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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.