Home / 321.50-680.75

Finding the Third Proportional to 321.50 and 680.75

Calculator

Solution

The third proportional to 321.50 and 680.75 is: 1,441.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    321.50 : 680.75 = 680.75 : x
  2. Step 2: Convert to fraction form
    321.50/680.75 = 680.75/x
  3. Step 3: Cross multiply
    321.50x = 680.75 × 680.75
  4. Step 4: Simplify right side
    321.50x = 463,420.56
  5. Step 5: Solve for x
    x = 463,420.56/321.50
  6. Step 6: Final answer
    x = 1,441.43

Related Problems

Find third proportional to 160.75 and 340.38
Half scale
Find third proportional to 643 and 1,361.50
Double scale
Find third proportional to 324 and 685
Similar ratio
Find third proportional to 482.25 and 1,021.13
1.5x scale

Why These Related Problems?

These problems maintain the same ratio (2.12) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.