Home / 2,216.40-3,321.60-1,121.56

Finding the Fourth Proportional to 2,216.40, 3,321.60 and 1,121.56

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Solution

The fourth proportional to 2,216.40, 3,321.60 and 1,121.56 is: 1,680.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,216.40 : 3,321.60 = 1,121.56 : x
  2. Step 2: Convert to fraction form
    2,216.40/3,321.60 = 1,121.56/x
  3. Step 3: Cross multiply
    2,216.40x = 3,321.60 × 1,121.56
  4. Step 4: Simplify right side
    2,216.40x = 3,725,373.70
  5. Step 5: Solve for x
    x = 3,725,373.70/2,216.40
  6. Step 6: Final answer
    x = 1,680.82

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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.