Home / 2,220.80-3,331.20-2,112.80

Finding the Fourth Proportional to 2,220.80, 3,331.20 and 2,112.80

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Solution

The fourth proportional to 2,220.80, 3,331.20 and 2,112.80 is: 3,169.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,220.80 : 3,331.20 = 2,112.80 : x
  2. Step 2: Convert to fraction form
    2,220.80/3,331.20 = 2,112.80/x
  3. Step 3: Cross multiply
    2,220.80x = 3,331.20 × 2,112.80
  4. Step 4: Simplify right side
    2,220.80x = 7,038,159.36
  5. Step 5: Solve for x
    x = 7,038,159.36/2,220.80
  6. Step 6: Final answer
    x = 3,169.20

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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.