Home / 80.50-129

Finding the Third Proportional to 80.50 and 129

Calculator

Solution

The third proportional to 80.50 and 129 is: 206.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    80.50 : 129 = 129 : x
  2. Step 2: Convert to fraction form
    80.50/129 = 129/x
  3. Step 3: Cross multiply
    80.50x = 129 × 129
  4. Step 4: Simplify right side
    80.50x = 16,641
  5. Step 5: Solve for x
    x = 16,641/80.50
  6. Step 6: Final answer
    x = 206.72

Related Problems

Find third proportional to 40.25 and 64.50
Half scale
Find third proportional to 161 and 258
Double scale
Find third proportional to 83 and 132
Similar ratio
Find third proportional to 120.75 and 193.50
1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.60) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.