Home / 615-655

Finding the Third Proportional to 615 and 655

Calculator

Solution

The third proportional to 615 and 655 is: 697.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    615 : 655 = 655 : x
  2. Step 2: Convert to fraction form
    615/655 = 655/x
  3. Step 3: Cross multiply
    615x = 655 × 655
  4. Step 4: Simplify right side
    615x = 429,025
  5. Step 5: Solve for x
    x = 429,025/615
  6. Step 6: Final answer
    x = 697.60

Related Problems

Find third proportional to 307.50 and 327.50
Half scale
Find third proportional to 1,230 and 1,310
Double scale
Find third proportional to 617 and 657
Similar ratio
Find third proportional to 922.50 and 982.50
1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.07) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.