Home / 21,406-28,403

Finding the Third Proportional to 21,406 and 28,403

Calculator

Solution

The third proportional to 21,406 and 28,403 is: 37,687.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,406 : 28,403 = 28,403 : x
  2. Step 2: Convert to fraction form
    21,406/28,403 = 28,403/x
  3. Step 3: Cross multiply
    21,406x = 28,403 × 28,403
  4. Step 4: Simplify right side
    21,406x = 806,730,409
  5. Step 5: Solve for x
    x = 806,730,409/21,406
  6. Step 6: Final answer
    x = 37,687.12

Related Problems

Find third proportional to 10,703 and 14,201.50
Half scale
Find third proportional to 42,812 and 56,806
Double scale
Find third proportional to 21,408 and 28,406
Similar ratio
Find third proportional to 32,109 and 42,604.50
1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.33) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.