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Finding the Fourth Proportional to 2,220.79, 3,331.20 and 660.82

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Solution

The fourth proportional to 2,220.79, 3,331.20 and 660.82 is: 991.23

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,220.79 : 3,331.20 = 660.82 : x
  2. Step 2: Convert to fraction form
    2,220.79/3,331.20 = 660.82/x
  3. Step 3: Cross multiply
    2,220.79x = 3,331.20 × 660.82
  4. Step 4: Simplify right side
    2,220.79x = 2,201,323.58
  5. Step 5: Solve for x
    x = 2,201,323.58/2,220.79
  6. Step 6: Final answer
    x = 991.23

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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.