Home / 86.63-128.81

Finding the Third Proportional to 86.63 and 128.81

Calculator

Solution

The third proportional to 86.63 and 128.81 is: 191.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    86.63 : 128.81 = 128.81 : x
  2. Step 2: Convert to fraction form
    86.63/128.81 = 128.81/x
  3. Step 3: Cross multiply
    86.63x = 128.81 × 128.81
  4. Step 4: Simplify right side
    86.63x = 16,592.66
  5. Step 5: Solve for x
    x = 16,592.66/86.63
  6. Step 6: Final answer
    x = 191.55

Related Problems

Find third proportional to 43.31 and 64.41
Half scale
Find third proportional to 173.25 and 257.63
Double scale
Find third proportional to 89 and 132
Similar ratio
Find third proportional to 129.94 and 193.22
1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.