Home / 40.50-81

Finding the Third Proportional to 40.50 and 81

Calculator

Solution

The third proportional to 40.50 and 81 is: 162

Step by Step Solution

  1. Step 1: Write the proportion equation
    40.50 : 81 = 81 : x
  2. Step 2: Convert to fraction form
    40.50/81 = 81/x
  3. Step 3: Cross multiply
    40.50x = 81 × 81
  4. Step 4: Simplify right side
    40.50x = 6,561
  5. Step 5: Solve for x
    x = 6,561/40.50
  6. Step 6: Final answer
    x = 162

Related Problems

Find third proportional to 20.25 and 40.50
Half scale
Find third proportional to 81 and 162
Double scale
Find third proportional to 43 and 85
Similar ratio
Find third proportional to 60.75 and 121.50
1.5x scale

Why These Related Problems?

These problems maintain the same ratio (2) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.