Home / 240.78-361.22-138.12

Finding the Fourth Proportional to 240.78, 361.22 and 138.12

Calculator

Solution

The fourth proportional to 240.78, 361.22 and 138.12 is: 207.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    240.78 : 361.22 = 138.12 : x
  2. Step 2: Convert to fraction form
    240.78/361.22 = 138.12/x
  3. Step 3: Cross multiply
    240.78x = 361.22 × 138.12
  4. Step 4: Simplify right side
    240.78x = 49,891.71
  5. Step 5: Solve for x
    x = 49,891.71/240.78
  6. Step 6: Final answer
    x = 207.21

Related Problems

Find fourth proportional to 120.39, 180.61 and 69.06
Half scale
Find fourth proportional to 481.56, 722.44 and 276.24
Double scale
Find fourth proportional to 241.78, 362.72 and 139.12
Similar ratio
Find fourth proportional to 361.17, 541.83 and 207.18
1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.