Home / 1.25-2

Finding the Third Proportional to 1.25 and 2

Calculator

Solution

The third proportional to 1.25 and 2 is: 3.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    1.25 : 2 = 2 : x
  2. Step 2: Convert to fraction form
    1.25/2 = 2/x
  3. Step 3: Cross multiply
    1.25x = 2 × 2
  4. Step 4: Simplify right side
    1.25x = 4
  5. Step 5: Solve for x
    x = 4/1.25
  6. Step 6: Final answer
    x = 3.20

Related Problems

Find third proportional to 0.63 and 1
Half scale
Find third proportional to 2.50 and 4
Double scale
Find third proportional to 3 and 5
Similar ratio
Find third proportional to 1.88 and 3
1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.60) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.