Home / 811.50-1,299.75

Finding the Third Proportional to 811.50 and 1,299.75

Calculator

Solution

The third proportional to 811.50 and 1,299.75 is: 2,081.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    811.50 : 1,299.75 = 1,299.75 : x
  2. Step 2: Convert to fraction form
    811.50/1,299.75 = 1,299.75/x
  3. Step 3: Cross multiply
    811.50x = 1,299.75 × 1,299.75
  4. Step 4: Simplify right side
    811.50x = 1,689,350.06
  5. Step 5: Solve for x
    x = 1,689,350.06/811.50
  6. Step 6: Final answer
    x = 2,081.76

Related Problems

Find third proportional to 405.75 and 649.88
Half scale
Find third proportional to 1,623 and 2,599.50
Double scale
Find third proportional to 814 and 1,303
Similar ratio
Find third proportional to 1,217.25 and 1,949.63
1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.60) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.