Home / 5-11

Finding the Third Proportional to 5 and 11

Calculator

Solution

The third proportional to 5 and 11 is: 24.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    5 : 11 = 11 : x
  2. Step 2: Convert to fraction form
    5/11 = 11/x
  3. Step 3: Cross multiply
    5x = 11 × 11
  4. Step 4: Simplify right side
    5x = 121
  5. Step 5: Solve for x
    x = 121/5
  6. Step 6: Final answer
    x = 24.20

Related Problems

Find third proportional to 2.50 and 5.50
Half scale
Find third proportional to 10 and 22
Double scale
Find third proportional to 7 and 15
Similar ratio
Find third proportional to 7.50 and 16.50
1.5x scale

Why These Related Problems?

These problems maintain the same ratio (2.20) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.