Home / 15,720-20,664

Finding the Third Proportional to 15,720 and 20,664

Calculator

Solution

The third proportional to 15,720 and 20,664 is: 27,162.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,720 : 20,664 = 20,664 : x
  2. Step 2: Convert to fraction form
    15,720/20,664 = 20,664/x
  3. Step 3: Cross multiply
    15,720x = 20,664 × 20,664
  4. Step 4: Simplify right side
    15,720x = 427,000,896
  5. Step 5: Solve for x
    x = 427,000,896/15,720
  6. Step 6: Final answer
    x = 27,162.91

Related Problems

Find third proportional to 7,860 and 10,332
Half scale
Find third proportional to 31,440 and 41,328
Double scale
Find third proportional to 15,722 and 20,667
Similar ratio
Find third proportional to 23,580 and 30,996
1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.31) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.