Home / 245-275

Finding the Third Proportional to 245 and 275

Calculator

Solution

The third proportional to 245 and 275 is: 308.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    245 : 275 = 275 : x
  2. Step 2: Convert to fraction form
    245/275 = 275/x
  3. Step 3: Cross multiply
    245x = 275 × 275
  4. Step 4: Simplify right side
    245x = 75,625
  5. Step 5: Solve for x
    x = 75,625/245
  6. Step 6: Final answer
    x = 308.67

Related Problems

Find third proportional to 122.50 and 137.50
Half scale
Find third proportional to 490 and 550
Double scale
Find third proportional to 247 and 277
Similar ratio
Find third proportional to 367.50 and 412.50
1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.12) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.