Home / 411-811

Finding the Third Proportional to 411 and 811

Calculator

Solution

The third proportional to 411 and 811 is: 1,600.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    411 : 811 = 811 : x
  2. Step 2: Convert to fraction form
    411/811 = 811/x
  3. Step 3: Cross multiply
    411x = 811 × 811
  4. Step 4: Simplify right side
    411x = 657,721
  5. Step 5: Solve for x
    x = 657,721/411
  6. Step 6: Final answer
    x = 1,600.29

Related Problems

Find third proportional to 205.50 and 405.50
Half scale
Find third proportional to 822 and 1,622
Double scale
Find third proportional to 413 and 815
Similar ratio
Find third proportional to 616.50 and 1,216.50
1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.97) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.