Home / 2.81-4

Finding the Third Proportional to 2.81 and 4

Calculator

Solution

The third proportional to 2.81 and 4 is: 5.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    2.81 : 4 = 4 : x
  2. Step 2: Convert to fraction form
    2.81/4 = 4/x
  3. Step 3: Cross multiply
    2.81x = 4 × 4
  4. Step 4: Simplify right side
    2.81x = 16
  5. Step 5: Solve for x
    x = 16/2.81
  6. Step 6: Final answer
    x = 5.69

Related Problems

Find third proportional to 1.41 and 2
Half scale
Find third proportional to 5.63 and 8
Double scale
Find third proportional to 5 and 7
Similar ratio
Find third proportional to 4.22 and 6
1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.42) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.