Home / 720-1,740

Finding the Third Proportional to 720 and 1,740

Calculator

Solution

The third proportional to 720 and 1,740 is: 4,205

Step by Step Solution

  1. Step 1: Write the proportion equation
    720 : 1,740 = 1,740 : x
  2. Step 2: Convert to fraction form
    720/1,740 = 1,740/x
  3. Step 3: Cross multiply
    720x = 1,740 × 1,740
  4. Step 4: Simplify right side
    720x = 3,027,600
  5. Step 5: Solve for x
    x = 3,027,600/720
  6. Step 6: Final answer
    x = 4,205

Related Problems

Find third proportional to 360 and 870
Half scale
Find third proportional to 1,440 and 3,480
Double scale
Find third proportional to 722 and 1,745
Similar ratio
Find third proportional to 1,080 and 2,610
1.5x scale

Why These Related Problems?

These problems maintain the same ratio (2.42) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.