Home / 7,200-12,840

Finding the Third Proportional to 7,200 and 12,840

Calculator

Solution

The third proportional to 7,200 and 12,840 is: 22,898

Step by Step Solution

  1. Step 1: Write the proportion equation
    7,200 : 12,840 = 12,840 : x
  2. Step 2: Convert to fraction form
    7,200/12,840 = 12,840/x
  3. Step 3: Cross multiply
    7,200x = 12,840 × 12,840
  4. Step 4: Simplify right side
    7,200x = 164,865,600
  5. Step 5: Solve for x
    x = 164,865,600/7,200
  6. Step 6: Final answer
    x = 22,898

Related Problems

Find third proportional to 3,600 and 6,420
Half scale
Find third proportional to 14,400 and 25,680
Double scale
Find third proportional to 7,202 and 12,844
Similar ratio
Find third proportional to 10,800 and 19,260
1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.78) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.