Home / 21,168-38,880

Finding the Third Proportional to 21,168 and 38,880

Calculator

Solution

The third proportional to 21,168 and 38,880 is: 71,412.24

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,168 : 38,880 = 38,880 : x
  2. Step 2: Convert to fraction form
    21,168/38,880 = 38,880/x
  3. Step 3: Cross multiply
    21,168x = 38,880 × 38,880
  4. Step 4: Simplify right side
    21,168x = 1,511,654,400
  5. Step 5: Solve for x
    x = 1,511,654,400/21,168
  6. Step 6: Final answer
    x = 71,412.24

Related Problems

Find third proportional to 10,584 and 19,440
Half scale
Find third proportional to 42,336 and 77,760
Double scale
Find third proportional to 21,170 and 38,884
Similar ratio
Find third proportional to 31,752 and 58,320
1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.84) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.