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Finding the Fourth Proportional to 2,122.43, 3,183.65 and 661.19

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Solution

The fourth proportional to 2,122.43, 3,183.65 and 661.19 is: 991.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,122.43 : 3,183.65 = 661.19 : x
  2. Step 2: Convert to fraction form
    2,122.43/3,183.65 = 661.19/x
  3. Step 3: Cross multiply
    2,122.43x = 3,183.65 × 661.19
  4. Step 4: Simplify right side
    2,122.43x = 2,104,997.54
  5. Step 5: Solve for x
    x = 2,104,997.54/2,122.43
  6. Step 6: Final answer
    x = 991.79

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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.