Home / 7,920-16,640

Finding the Third Proportional to 7,920 and 16,640

Calculator

Solution

The third proportional to 7,920 and 16,640 is: 34,960.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    7,920 : 16,640 = 16,640 : x
  2. Step 2: Convert to fraction form
    7,920/16,640 = 16,640/x
  3. Step 3: Cross multiply
    7,920x = 16,640 × 16,640
  4. Step 4: Simplify right side
    7,920x = 276,889,600
  5. Step 5: Solve for x
    x = 276,889,600/7,920
  6. Step 6: Final answer
    x = 34,960.81

Related Problems

Find third proportional to 3,960 and 8,320
Half scale
Find third proportional to 15,840 and 33,280
Double scale
Find third proportional to 7,922 and 16,644
Similar ratio
Find third proportional to 11,880 and 24,960
1.5x scale

Why These Related Problems?

These problems maintain the same ratio (2.10) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.