Home / 15.50-20

Finding the Third Proportional to 15.50 and 20

Calculator

Solution

The third proportional to 15.50 and 20 is: 25.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    15.50 : 20 = 20 : x
  2. Step 2: Convert to fraction form
    15.50/20 = 20/x
  3. Step 3: Cross multiply
    15.50x = 20 × 20
  4. Step 4: Simplify right side
    15.50x = 400
  5. Step 5: Solve for x
    x = 400/15.50
  6. Step 6: Final answer
    x = 25.81

Related Problems

Find third proportional to 7.75 and 10
Half scale
Find third proportional to 31 and 40
Double scale
Find third proportional to 18 and 23
Similar ratio
Find third proportional to 23.25 and 30
1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.29) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.