Home / 68.69-136.38

Finding the Third Proportional to 68.69 and 136.38

Calculator

Solution

The third proportional to 68.69 and 136.38 is: 270.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    68.69 : 136.38 = 136.38 : x
  2. Step 2: Convert to fraction form
    68.69/136.38 = 136.38/x
  3. Step 3: Cross multiply
    68.69x = 136.38 × 136.38
  4. Step 4: Simplify right side
    68.69x = 18,598.14
  5. Step 5: Solve for x
    x = 18,598.14/68.69
  6. Step 6: Final answer
    x = 270.76

Related Problems

Find third proportional to 34.34 and 68.19
Half scale
Find third proportional to 137.38 and 272.75
Double scale
Find third proportional to 71 and 140
Similar ratio
Find third proportional to 103.03 and 204.56
1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.99) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.