Home / 2,121.95-3,183.23-661.25

Finding the Fourth Proportional to 2,121.95, 3,183.23 and 661.25

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Solution

The fourth proportional to 2,121.95, 3,183.23 and 661.25 is: 991.97

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,121.95 : 3,183.23 = 661.25 : x
  2. Step 2: Convert to fraction form
    2,121.95/3,183.23 = 661.25/x
  3. Step 3: Cross multiply
    2,121.95x = 3,183.23 × 661.25
  4. Step 4: Simplify right side
    2,121.95x = 2,104,920.45
  5. Step 5: Solve for x
    x = 2,104,920.45/2,121.95
  6. Step 6: Final answer
    x = 991.97

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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.