Home / 1,943.36-2,912.48-1,121.20

Finding the Fourth Proportional to 1,943.36, 2,912.48 and 1,121.20

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Solution

The fourth proportional to 1,943.36, 2,912.48 and 1,121.20 is: 1,680.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,943.36 : 2,912.48 = 1,121.20 : x
  2. Step 2: Convert to fraction form
    1,943.36/2,912.48 = 1,121.20/x
  3. Step 3: Cross multiply
    1,943.36x = 2,912.48 × 1,121.20
  4. Step 4: Simplify right side
    1,943.36x = 3,265,472.58
  5. Step 5: Solve for x
    x = 3,265,472.58/1,943.36
  6. Step 6: Final answer
    x = 1,680.32

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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.