Home / 80-121

Finding the Third Proportional to 80 and 121

Calculator

Solution

The third proportional to 80 and 121 is: 183.01

Step by Step Solution

  1. Step 1: Write the proportion equation
    80 : 121 = 121 : x
  2. Step 2: Convert to fraction form
    80/121 = 121/x
  3. Step 3: Cross multiply
    80x = 121 × 121
  4. Step 4: Simplify right side
    80x = 14,641
  5. Step 5: Solve for x
    x = 14,641/80
  6. Step 6: Final answer
    x = 183.01

Related Problems

Find third proportional to 40 and 60.50
Half scale
Find third proportional to 160 and 242
Double scale
Find third proportional to 82 and 124
Similar ratio
Find third proportional to 120 and 181.50
1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.51) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.