Home / 621-891

Finding the Third Proportional to 621 and 891

Calculator

Solution

The third proportional to 621 and 891 is: 1,278.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    621 : 891 = 891 : x
  2. Step 2: Convert to fraction form
    621/891 = 891/x
  3. Step 3: Cross multiply
    621x = 891 × 891
  4. Step 4: Simplify right side
    621x = 793,881
  5. Step 5: Solve for x
    x = 793,881/621
  6. Step 6: Final answer
    x = 1,278.39

Related Problems

Find third proportional to 310.50 and 445.50
Half scale
Find third proportional to 1,242 and 1,782
Double scale
Find third proportional to 623 and 894
Similar ratio
Find third proportional to 931.50 and 1,336.50
1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.43) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.