Home / 393.40-812.11

Finding the Third Proportional to 393.40 and 812.11

Calculator

Solution

The third proportional to 393.40 and 812.11 is: 1,676.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    393.40 : 812.11 = 812.11 : x
  2. Step 2: Convert to fraction form
    393.40/812.11 = 812.11/x
  3. Step 3: Cross multiply
    393.40x = 812.11 × 812.11
  4. Step 4: Simplify right side
    393.40x = 659,521.64
  5. Step 5: Solve for x
    x = 659,521.64/393.40
  6. Step 6: Final answer
    x = 1,676.47

Related Problems

Find third proportional to 196.70 and 406.05
Half scale
Find third proportional to 786.80 and 1,624.22
Double scale
Find third proportional to 395 and 816
Similar ratio
Find third proportional to 590.10 and 1,218.16
1.5x scale

Why These Related Problems?

These problems maintain the same ratio (2.06) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.