Home / 1,209-1,621

Finding the Third Proportional to 1,209 and 1,621

Calculator

Solution

The third proportional to 1,209 and 1,621 is: 2,173.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,209 : 1,621 = 1,621 : x
  2. Step 2: Convert to fraction form
    1,209/1,621 = 1,621/x
  3. Step 3: Cross multiply
    1,209x = 1,621 × 1,621
  4. Step 4: Simplify right side
    1,209x = 2,627,641
  5. Step 5: Solve for x
    x = 2,627,641/1,209
  6. Step 6: Final answer
    x = 2,173.40

Related Problems

Find third proportional to 604.50 and 810.50
Half scale
Find third proportional to 2,418 and 3,242
Double scale
Find third proportional to 1,211 and 1,624
Similar ratio
Find third proportional to 1,813.50 and 2,431.50
1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.34) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.