Home / 220.01-330-90

Finding the Fourth Proportional to 220.01, 330 and 90

Calculator

Solution

The fourth proportional to 220.01, 330 and 90 is: 135.00

Step by Step Solution

  1. Step 1: Write the proportion equation
    220.01 : 330 = 90 : x
  2. Step 2: Convert to fraction form
    220.01/330 = 90/x
  3. Step 3: Cross multiply
    220.01x = 330 × 90
  4. Step 4: Simplify right side
    220.01x = 29,700
  5. Step 5: Solve for x
    x = 29,700/220.01
  6. Step 6: Final answer
    x = 135.00

Related Problems

Find fourth proportional to 110.00, 165 and 45
Half scale
Find fourth proportional to 440.01, 660 and 180
Double scale
Find fourth proportional to 221.01, 331.50 and 91
Similar ratio
Find fourth proportional to 330.01, 495 and 135
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.