Home / 3,912-7,920

Finding the Third Proportional to 3,912 and 7,920

Calculator

Solution

The third proportional to 3,912 and 7,920 is: 16,034.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,912 : 7,920 = 7,920 : x
  2. Step 2: Convert to fraction form
    3,912/7,920 = 7,920/x
  3. Step 3: Cross multiply
    3,912x = 7,920 × 7,920
  4. Step 4: Simplify right side
    3,912x = 62,726,400
  5. Step 5: Solve for x
    x = 62,726,400/3,912
  6. Step 6: Final answer
    x = 16,034.36

Related Problems

Find third proportional to 1,956 and 3,960
Half scale
Find third proportional to 7,824 and 15,840
Double scale
Find third proportional to 3,914 and 7,924
Similar ratio
Find third proportional to 5,868 and 11,880
1.5x scale

Why These Related Problems?

These problems maintain the same ratio (2.02) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.