Home / 11.91-28.78

Finding the Third Proportional to 11.91 and 28.78

Calculator

Solution

The third proportional to 11.91 and 28.78 is: 69.57

Step by Step Solution

  1. Step 1: Write the proportion equation
    11.91 : 28.78 = 28.78 : x
  2. Step 2: Convert to fraction form
    11.91/28.78 = 28.78/x
  3. Step 3: Cross multiply
    11.91x = 28.78 × 28.78
  4. Step 4: Simplify right side
    11.91x = 828.36
  5. Step 5: Solve for x
    x = 828.36/11.91
  6. Step 6: Final answer
    x = 69.57

Related Problems

Find third proportional to 5.95 and 14.39
Half scale
Find third proportional to 23.81 and 57.56
Double scale
Find third proportional to 14 and 34
Similar ratio
Find third proportional to 17.86 and 43.17
1.5x scale

Why These Related Problems?

These problems maintain the same ratio (2.42) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.