Home / 2,122.12-3,183.18-661.28

Finding the Fourth Proportional to 2,122.12, 3,183.18 and 661.28

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Solution

The fourth proportional to 2,122.12, 3,183.18 and 661.28 is: 991.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,122.12 : 3,183.18 = 661.28 : x
  2. Step 2: Convert to fraction form
    2,122.12/3,183.18 = 661.28/x
  3. Step 3: Cross multiply
    2,122.12x = 3,183.18 × 661.28
  4. Step 4: Simplify right side
    2,122.12x = 2,104,973.27
  5. Step 5: Solve for x
    x = 2,104,973.27/2,122.12
  6. Step 6: Final answer
    x = 991.92

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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.