Home / 20.81-36.47

Finding the Third Proportional to 20.81 and 36.47

Calculator

Solution

The third proportional to 20.81 and 36.47 is: 63.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    20.81 : 36.47 = 36.47 : x
  2. Step 2: Convert to fraction form
    20.81/36.47 = 36.47/x
  3. Step 3: Cross multiply
    20.81x = 36.47 × 36.47
  4. Step 4: Simplify right side
    20.81x = 1,329.97
  5. Step 5: Solve for x
    x = 1,329.97/20.81
  6. Step 6: Final answer
    x = 63.90

Related Problems

Find third proportional to 10.41 and 18.23
Half scale
Find third proportional to 41.63 and 72.94
Double scale
Find third proportional to 23 and 40
Similar ratio
Find third proportional to 31.22 and 54.70
1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.75) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.