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Finding the Fourth Proportional to 2,221, 3,331.41 and 660.94

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Solution

The fourth proportional to 2,221, 3,331.41 and 660.94 is: 991.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,221 : 3,331.41 = 660.94 : x
  2. Step 2: Convert to fraction form
    2,221/3,331.41 = 660.94/x
  3. Step 3: Cross multiply
    2,221x = 3,331.41 × 660.94
  4. Step 4: Simplify right side
    2,221x = 2,201,862.13
  5. Step 5: Solve for x
    x = 2,201,862.13/2,221
  6. Step 6: Final answer
    x = 991.38

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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.