Home / 13,728-20,640

Finding the Third Proportional to 13,728 and 20,640

Calculator

Solution

The third proportional to 13,728 and 20,640 is: 31,032.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,728 : 20,640 = 20,640 : x
  2. Step 2: Convert to fraction form
    13,728/20,640 = 20,640/x
  3. Step 3: Cross multiply
    13,728x = 20,640 × 20,640
  4. Step 4: Simplify right side
    13,728x = 426,009,600
  5. Step 5: Solve for x
    x = 426,009,600/13,728
  6. Step 6: Final answer
    x = 31,032.17

Related Problems

Find third proportional to 6,864 and 10,320
Half scale
Find third proportional to 27,456 and 41,280
Double scale
Find third proportional to 13,730 and 20,643
Similar ratio
Find third proportional to 20,592 and 30,960
1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.