Home / 289-398

Finding the Third Proportional to 289 and 398

Calculator

Solution

The third proportional to 289 and 398 is: 548.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    289 : 398 = 398 : x
  2. Step 2: Convert to fraction form
    289/398 = 398/x
  3. Step 3: Cross multiply
    289x = 398 × 398
  4. Step 4: Simplify right side
    289x = 158,404
  5. Step 5: Solve for x
    x = 158,404/289
  6. Step 6: Final answer
    x = 548.11

Related Problems

Find third proportional to 144.50 and 199
Half scale
Find third proportional to 578 and 796
Double scale
Find third proportional to 291 and 401
Similar ratio
Find third proportional to 433.50 and 597
1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.