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Finding the Fourth Proportional to 2,629.04, 3,942.17 and 779.90

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Solution

The fourth proportional to 2,629.04, 3,942.17 and 779.90 is: 1,169.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,629.04 : 3,942.17 = 779.90 : x
  2. Step 2: Convert to fraction form
    2,629.04/3,942.17 = 779.90/x
  3. Step 3: Cross multiply
    2,629.04x = 3,942.17 × 779.90
  4. Step 4: Simplify right side
    2,629.04x = 3,074,478.67
  5. Step 5: Solve for x
    x = 3,074,478.67/2,629.04
  6. Step 6: Final answer
    x = 1,169.43

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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.