Home / 128-321

Finding the Third Proportional to 128 and 321

Calculator

Solution

The third proportional to 128 and 321 is: 805.01

Step by Step Solution

  1. Step 1: Write the proportion equation
    128 : 321 = 321 : x
  2. Step 2: Convert to fraction form
    128/321 = 321/x
  3. Step 3: Cross multiply
    128x = 321 × 321
  4. Step 4: Simplify right side
    128x = 103,041
  5. Step 5: Solve for x
    x = 103,041/128
  6. Step 6: Final answer
    x = 805.01

Related Problems

Why These Related Problems?

These problems maintain the same ratio (2.51) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.