Home / 120.75-281.25

Finding the Third Proportional to 120.75 and 281.25

Calculator

Solution

The third proportional to 120.75 and 281.25 is: 655.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    120.75 : 281.25 = 281.25 : x
  2. Step 2: Convert to fraction form
    120.75/281.25 = 281.25/x
  3. Step 3: Cross multiply
    120.75x = 281.25 × 281.25
  4. Step 4: Simplify right side
    120.75x = 79,101.56
  5. Step 5: Solve for x
    x = 79,101.56/120.75
  6. Step 6: Final answer
    x = 655.09

Related Problems

Find third proportional to 60.38 and 140.63
Half scale
Find third proportional to 241.50 and 562.50
Double scale
Find third proportional to 123 and 286
Similar ratio
Find third proportional to 181.13 and 421.88
1.5x scale

Why These Related Problems?

These problems maintain the same ratio (2.33) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.