Home / 68-80

Finding the Third Proportional to 68 and 80

Calculator

Solution

The third proportional to 68 and 80 is: 94.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    68 : 80 = 80 : x
  2. Step 2: Convert to fraction form
    68/80 = 80/x
  3. Step 3: Cross multiply
    68x = 80 × 80
  4. Step 4: Simplify right side
    68x = 6,400
  5. Step 5: Solve for x
    x = 6,400/68
  6. Step 6: Final answer
    x = 94.12

Related Problems

Find third proportional to 34 and 40
Half scale
Find third proportional to 136 and 160
Double scale
Find third proportional to 70 and 82
Similar ratio
Find third proportional to 102 and 120
1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.18) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.