Home / 21.22-31.83-6

Finding the Fourth Proportional to 21.22, 31.83 and 6

Calculator

Solution

The fourth proportional to 21.22, 31.83 and 6 is: 9.00

Step by Step Solution

  1. Step 1: Write the proportion equation
    21.22 : 31.83 = 6 : x
  2. Step 2: Convert to fraction form
    21.22/31.83 = 6/x
  3. Step 3: Cross multiply
    21.22x = 31.83 × 6
  4. Step 4: Simplify right side
    21.22x = 190.95
  5. Step 5: Solve for x
    x = 190.95/21.22
  6. Step 6: Final answer
    x = 9.00

Related Problems

Find fourth proportional to 10.61, 15.91 and 3
Half scale
Find fourth proportional to 42.43, 63.65 and 12
Double scale
Find fourth proportional to 22.22, 33.33 and 7
Similar ratio
Find fourth proportional to 31.82, 47.74 and 9
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.