Home / 1,389-1,929

Finding the Third Proportional to 1,389 and 1,929

Calculator

Solution

The third proportional to 1,389 and 1,929 is: 2,678.94

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,389 : 1,929 = 1,929 : x
  2. Step 2: Convert to fraction form
    1,389/1,929 = 1,929/x
  3. Step 3: Cross multiply
    1,389x = 1,929 × 1,929
  4. Step 4: Simplify right side
    1,389x = 3,721,041
  5. Step 5: Solve for x
    x = 3,721,041/1,389
  6. Step 6: Final answer
    x = 2,678.94

Related Problems

Find third proportional to 694.50 and 964.50
Half scale
Find third proportional to 2,778 and 3,858
Double scale
Find third proportional to 1,391 and 1,932
Similar ratio
Find third proportional to 2,083.50 and 2,893.50
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.