Home / 2,121.90-3,183.81-1,146.86

Finding the Fourth Proportional to 2,121.90, 3,183.81 and 1,146.86

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Solution

The fourth proportional to 2,121.90, 3,183.81 and 1,146.86 is: 1,720.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,121.90 : 3,183.81 = 1,146.86 : x
  2. Step 2: Convert to fraction form
    2,121.90/3,183.81 = 1,146.86/x
  3. Step 3: Cross multiply
    2,121.90x = 3,183.81 × 1,146.86
  4. Step 4: Simplify right side
    2,121.90x = 3,651,378.60
  5. Step 5: Solve for x
    x = 3,651,378.60/2,121.90
  6. Step 6: Final answer
    x = 1,720.81

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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.