Home / 1,620-3,420

Finding the Third Proportional to 1,620 and 3,420

Calculator

Solution

The third proportional to 1,620 and 3,420 is: 7,220

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,620 : 3,420 = 3,420 : x
  2. Step 2: Convert to fraction form
    1,620/3,420 = 3,420/x
  3. Step 3: Cross multiply
    1,620x = 3,420 × 3,420
  4. Step 4: Simplify right side
    1,620x = 11,696,400
  5. Step 5: Solve for x
    x = 11,696,400/1,620
  6. Step 6: Final answer
    x = 7,220

Related Problems

Find third proportional to 810 and 1,710
Half scale
Find third proportional to 3,240 and 6,840
Double scale
Find third proportional to 1,622 and 3,424
Similar ratio
Find third proportional to 2,430 and 5,130
1.5x scale

Why These Related Problems?

These problems maintain the same ratio (2.11) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.