Home / 850-1,800

Finding the Third Proportional to 850 and 1,800

Calculator

Solution

The third proportional to 850 and 1,800 is: 3,811.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    850 : 1,800 = 1,800 : x
  2. Step 2: Convert to fraction form
    850/1,800 = 1,800/x
  3. Step 3: Cross multiply
    850x = 1,800 × 1,800
  4. Step 4: Simplify right side
    850x = 3,240,000
  5. Step 5: Solve for x
    x = 3,240,000/850
  6. Step 6: Final answer
    x = 3,811.76

Related Problems

Find third proportional to 425 and 900
Half scale
Find third proportional to 1,700 and 3,600
Double scale
Find third proportional to 852 and 1,804
Similar ratio
Find third proportional to 1,275 and 2,700
1.5x scale

Why These Related Problems?

These problems maintain the same ratio (2.12) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.