Home / 126-138

Finding the Third Proportional to 126 and 138

Calculator

Solution

The third proportional to 126 and 138 is: 151.14

Step by Step Solution

  1. Step 1: Write the proportion equation
    126 : 138 = 138 : x
  2. Step 2: Convert to fraction form
    126/138 = 138/x
  3. Step 3: Cross multiply
    126x = 138 × 138
  4. Step 4: Simplify right side
    126x = 19,044
  5. Step 5: Solve for x
    x = 19,044/126
  6. Step 6: Final answer
    x = 151.14

Related Problems

Find third proportional to 63 and 69
Half scale
Find third proportional to 252 and 276
Double scale
Find third proportional to 128 and 140
Similar ratio
Find third proportional to 189 and 207
1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.10) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.