Home / 399.25-857

Finding the Third Proportional to 399.25 and 857

Calculator

Solution

The third proportional to 399.25 and 857 is: 1,839.57

Step by Step Solution

  1. Step 1: Write the proportion equation
    399.25 : 857 = 857 : x
  2. Step 2: Convert to fraction form
    399.25/857 = 857/x
  3. Step 3: Cross multiply
    399.25x = 857 × 857
  4. Step 4: Simplify right side
    399.25x = 734,449
  5. Step 5: Solve for x
    x = 734,449/399.25
  6. Step 6: Final answer
    x = 1,839.57

Related Problems

Find third proportional to 199.63 and 428.50
Half scale
Find third proportional to 798.50 and 1,714
Double scale
Find third proportional to 401 and 861
Similar ratio
Find third proportional to 598.88 and 1,285.50
1.5x scale

Why These Related Problems?

These problems maintain the same ratio (2.15) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.