Home / 1,942.80-2,911.41-1,121.28

Finding the Fourth Proportional to 1,942.80, 2,911.41 and 1,121.28

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Solution

The fourth proportional to 1,942.80, 2,911.41 and 1,121.28 is: 1,680.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,942.80 : 2,911.41 = 1,121.28 : x
  2. Step 2: Convert to fraction form
    1,942.80/2,911.41 = 1,121.28/x
  3. Step 3: Cross multiply
    1,942.80x = 2,911.41 × 1,121.28
  4. Step 4: Simplify right side
    1,942.80x = 3,264,505.80
  5. Step 5: Solve for x
    x = 3,264,505.80/1,942.80
  6. Step 6: Final answer
    x = 1,680.31

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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.