Home / 129.09-311.34

Finding the Third Proportional to 129.09 and 311.34

Calculator

Solution

The third proportional to 129.09 and 311.34 is: 750.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    129.09 : 311.34 = 311.34 : x
  2. Step 2: Convert to fraction form
    129.09/311.34 = 311.34/x
  3. Step 3: Cross multiply
    129.09x = 311.34 × 311.34
  4. Step 4: Simplify right side
    129.09x = 96,934.93
  5. Step 5: Solve for x
    x = 96,934.93/129.09
  6. Step 6: Final answer
    x = 750.89

Related Problems

Find third proportional to 64.55 and 155.67
Half scale
Find third proportional to 258.19 and 622.69
Double scale
Find third proportional to 131 and 316
Similar ratio
Find third proportional to 193.64 and 467.02
1.5x scale

Why These Related Problems?

These problems maintain the same ratio (2.41) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.