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Finding the Fourth Proportional to 2,221.56, 3,331.28 and 661.16

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Solution

The fourth proportional to 2,221.56, 3,331.28 and 661.16 is: 991.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,221.56 : 3,331.28 = 661.16 : x
  2. Step 2: Convert to fraction form
    2,221.56/3,331.28 = 661.16/x
  3. Step 3: Cross multiply
    2,221.56x = 3,331.28 × 661.16
  4. Step 4: Simplify right side
    2,221.56x = 2,202,509.08
  5. Step 5: Solve for x
    x = 2,202,509.08/2,221.56
  6. Step 6: Final answer
    x = 991.42

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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.