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Finding the Fourth Proportional to 1,940.15, 2,909.09 and 769.20

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Solution

The fourth proportional to 1,940.15, 2,909.09 and 769.20 is: 1,153.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,940.15 : 2,909.09 = 769.20 : x
  2. Step 2: Convert to fraction form
    1,940.15/2,909.09 = 769.20/x
  3. Step 3: Cross multiply
    1,940.15x = 2,909.09 × 769.20
  4. Step 4: Simplify right side
    1,940.15x = 2,237,663.04
  5. Step 5: Solve for x
    x = 2,237,663.04/1,940.15
  6. Step 6: Final answer
    x = 1,153.34

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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.