Home / 13,638-18,729

Finding the Third Proportional to 13,638 and 18,729

Calculator

Solution

The third proportional to 13,638 and 18,729 is: 25,720.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,638 : 18,729 = 18,729 : x
  2. Step 2: Convert to fraction form
    13,638/18,729 = 18,729/x
  3. Step 3: Cross multiply
    13,638x = 18,729 × 18,729
  4. Step 4: Simplify right side
    13,638x = 350,775,441
  5. Step 5: Solve for x
    x = 350,775,441/13,638
  6. Step 6: Final answer
    x = 25,720.45

Related Problems

Find third proportional to 6,819 and 9,364.50
Half scale
Find third proportional to 27,276 and 37,458
Double scale
Find third proportional to 13,640 and 18,732
Similar ratio
Find third proportional to 20,457 and 28,093.50
1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.37) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.