Home / 4.00-6-3.81

Finding the Fourth Proportional to 4.00, 6 and 3.81

Calculator

Solution

The fourth proportional to 4.00, 6 and 3.81 is: 5.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    4.00 : 6 = 3.81 : x
  2. Step 2: Convert to fraction form
    4.00/6 = 3.81/x
  3. Step 3: Cross multiply
    4.00x = 6 × 3.81
  4. Step 4: Simplify right side
    4.00x = 22.86
  5. Step 5: Solve for x
    x = 22.86/4.00
  6. Step 6: Final answer
    x = 5.72

Related Problems

Find fourth proportional to 2.00, 3 and 1.91
Half scale
Find fourth proportional to 8.00, 12 and 7.62
Double scale
Find fourth proportional to 5, 7.50 and 4.81
Similar ratio
Find fourth proportional to 6.00, 9 and 5.72
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.