Home / 515-655

Finding the Third Proportional to 515 and 655

Calculator

Solution

The third proportional to 515 and 655 is: 833.06

Step by Step Solution

  1. Step 1: Write the proportion equation
    515 : 655 = 655 : x
  2. Step 2: Convert to fraction form
    515/655 = 655/x
  3. Step 3: Cross multiply
    515x = 655 × 655
  4. Step 4: Simplify right side
    515x = 429,025
  5. Step 5: Solve for x
    x = 429,025/515
  6. Step 6: Final answer
    x = 833.06

Related Problems

Find third proportional to 257.50 and 327.50
Half scale
Find third proportional to 1,030 and 1,310
Double scale
Find third proportional to 517 and 658
Similar ratio
Find third proportional to 772.50 and 982.50
1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.27) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.