Home / 673-721

Finding the Third Proportional to 673 and 721

Calculator

Solution

The third proportional to 673 and 721 is: 772.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    673 : 721 = 721 : x
  2. Step 2: Convert to fraction form
    673/721 = 721/x
  3. Step 3: Cross multiply
    673x = 721 × 721
  4. Step 4: Simplify right side
    673x = 519,841
  5. Step 5: Solve for x
    x = 519,841/673
  6. Step 6: Final answer
    x = 772.42

Related Problems

Find third proportional to 336.50 and 360.50
Half scale
Find third proportional to 1,346 and 1,442
Double scale
Find third proportional to 675 and 723
Similar ratio
Find third proportional to 1,009.50 and 1,081.50
1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.07) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.