Home / 79.25-128.63

Finding the Third Proportional to 79.25 and 128.63

Calculator

Solution

The third proportional to 79.25 and 128.63 is: 208.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    79.25 : 128.63 = 128.63 : x
  2. Step 2: Convert to fraction form
    79.25/128.63 = 128.63/x
  3. Step 3: Cross multiply
    79.25x = 128.63 × 128.63
  4. Step 4: Simplify right side
    79.25x = 16,544.39
  5. Step 5: Solve for x
    x = 16,544.39/79.25
  6. Step 6: Final answer
    x = 208.76

Related Problems

Find third proportional to 39.63 and 64.31
Half scale
Find third proportional to 158.50 and 257.25
Double scale
Find third proportional to 81 and 132
Similar ratio
Find third proportional to 118.88 and 192.94
1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.62) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.