Home / 771-878

Finding the Third Proportional to 771 and 878

Calculator

Solution

The third proportional to 771 and 878 is: 999.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    771 : 878 = 878 : x
  2. Step 2: Convert to fraction form
    771/878 = 878/x
  3. Step 3: Cross multiply
    771x = 878 × 878
  4. Step 4: Simplify right side
    771x = 770,884
  5. Step 5: Solve for x
    x = 770,884/771
  6. Step 6: Final answer
    x = 999.85

Related Problems

Find third proportional to 385.50 and 439
Half scale
Find third proportional to 1,542 and 1,756
Double scale
Find third proportional to 773 and 880
Similar ratio
Find third proportional to 1,156.50 and 1,317
1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.14) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.