Home / 2,121.89-3,183.37-661.05

Finding the Fourth Proportional to 2,121.89, 3,183.37 and 661.05

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Solution

The fourth proportional to 2,121.89, 3,183.37 and 661.05 is: 991.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,121.89 : 3,183.37 = 661.05 : x
  2. Step 2: Convert to fraction form
    2,121.89/3,183.37 = 661.05/x
  3. Step 3: Cross multiply
    2,121.89x = 3,183.37 × 661.05
  4. Step 4: Simplify right side
    2,121.89x = 2,104,365.09
  5. Step 5: Solve for x
    x = 2,104,365.09/2,121.89
  6. Step 6: Final answer
    x = 991.74

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1.5x scale

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.