Home / 2.21-3.30-2

Finding the Fourth Proportional to 2.21, 3.30 and 2

Calculator

Solution

The fourth proportional to 2.21, 3.30 and 2 is: 2.99

Step by Step Solution

  1. Step 1: Write the proportion equation
    2.21 : 3.30 = 2 : x
  2. Step 2: Convert to fraction form
    2.21/3.30 = 2/x
  3. Step 3: Cross multiply
    2.21x = 3.30 × 2
  4. Step 4: Simplify right side
    2.21x = 6.60
  5. Step 5: Solve for x
    x = 6.60/2.21
  6. Step 6: Final answer
    x = 2.99

Related Problems

Find fourth proportional to 1.11, 1.65 and 1
Half scale
Find fourth proportional to 4.42, 6.60 and 4
Double scale
Find fourth proportional to 3.21, 4.79 and 3
Similar ratio
Find fourth proportional to 3.32, 4.95 and 3
1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.