Home / 1,388-2,215

Finding the Third Proportional to 1,388 and 2,215

Calculator

Solution

The third proportional to 1,388 and 2,215 is: 3,534.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,388 : 2,215 = 2,215 : x
  2. Step 2: Convert to fraction form
    1,388/2,215 = 2,215/x
  3. Step 3: Cross multiply
    1,388x = 2,215 × 2,215
  4. Step 4: Simplify right side
    1,388x = 4,906,225
  5. Step 5: Solve for x
    x = 4,906,225/1,388
  6. Step 6: Final answer
    x = 3,534.74

Related Problems

Find third proportional to 694 and 1,107.50
Half scale
Find third proportional to 2,776 and 4,430
Double scale
Find third proportional to 1,390 and 2,218
Similar ratio
Find third proportional to 2,082 and 3,322.50
1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.60) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.