Home / 628-839

Finding the Third Proportional to 628 and 839

Calculator

Solution

The third proportional to 628 and 839 is: 1,120.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    628 : 839 = 839 : x
  2. Step 2: Convert to fraction form
    628/839 = 839/x
  3. Step 3: Cross multiply
    628x = 839 × 839
  4. Step 4: Simplify right side
    628x = 703,921
  5. Step 5: Solve for x
    x = 703,921/628
  6. Step 6: Final answer
    x = 1,120.89

Related Problems

Find third proportional to 314 and 419.50
Half scale
Find third proportional to 1,256 and 1,678
Double scale
Find third proportional to 630 and 842
Similar ratio
Find third proportional to 942 and 1,258.50
1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.34) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.