Home / 631-878

Finding the Third Proportional to 631 and 878

Calculator

Solution

The third proportional to 631 and 878 is: 1,221.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    631 : 878 = 878 : x
  2. Step 2: Convert to fraction form
    631/878 = 878/x
  3. Step 3: Cross multiply
    631x = 878 × 878
  4. Step 4: Simplify right side
    631x = 770,884
  5. Step 5: Solve for x
    x = 770,884/631
  6. Step 6: Final answer
    x = 1,221.69

Related Problems

Find third proportional to 315.50 and 439
Half scale
Find third proportional to 1,262 and 1,756
Double scale
Find third proportional to 633 and 881
Similar ratio
Find third proportional to 946.50 and 1,317
1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.39) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.