Home / 86-218

Finding the Third Proportional to 86 and 218

Calculator

Solution

The third proportional to 86 and 218 is: 552.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    86 : 218 = 218 : x
  2. Step 2: Convert to fraction form
    86/218 = 218/x
  3. Step 3: Cross multiply
    86x = 218 × 218
  4. Step 4: Simplify right side
    86x = 47,524
  5. Step 5: Solve for x
    x = 47,524/86
  6. Step 6: Final answer
    x = 552.60

Related Problems

Find third proportional to 43 and 109
Half scale
Find third proportional to 172 and 436
Double scale
Find third proportional to 88 and 223
Similar ratio
Find third proportional to 129 and 327
1.5x scale

Why These Related Problems?

These problems maintain the same ratio (2.53) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.