Home / 138.25-242

Finding the Third Proportional to 138.25 and 242

Calculator

Solution

The third proportional to 138.25 and 242 is: 423.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    138.25 : 242 = 242 : x
  2. Step 2: Convert to fraction form
    138.25/242 = 242/x
  3. Step 3: Cross multiply
    138.25x = 242 × 242
  4. Step 4: Simplify right side
    138.25x = 58,564
  5. Step 5: Solve for x
    x = 58,564/138.25
  6. Step 6: Final answer
    x = 423.61

Related Problems

Find third proportional to 69.13 and 121
Half scale
Find third proportional to 276.50 and 484
Double scale
Find third proportional to 140 and 246
Similar ratio
Find third proportional to 207.38 and 363
1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.75) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.