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Finding the Fourth Proportional to 2,221.49, 3,331.20 and 660.92

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Solution

The fourth proportional to 2,221.49, 3,331.20 and 660.92 is: 991.07

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,221.49 : 3,331.20 = 660.92 : x
  2. Step 2: Convert to fraction form
    2,221.49/3,331.20 = 660.92/x
  3. Step 3: Cross multiply
    2,221.49x = 3,331.20 × 660.92
  4. Step 4: Simplify right side
    2,221.49x = 2,201,656.70
  5. Step 5: Solve for x
    x = 2,201,656.70/2,221.49
  6. Step 6: Final answer
    x = 991.07

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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.