Home / 360.15-540.21-129.05

Finding the Fourth Proportional to 360.15, 540.21 and 129.05

Calculator

Solution

The fourth proportional to 360.15, 540.21 and 129.05 is: 193.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    360.15 : 540.21 = 129.05 : x
  2. Step 2: Convert to fraction form
    360.15/540.21 = 129.05/x
  3. Step 3: Cross multiply
    360.15x = 540.21 × 129.05
  4. Step 4: Simplify right side
    360.15x = 69,711.40
  5. Step 5: Solve for x
    x = 69,711.40/360.15
  6. Step 6: Final answer
    x = 193.56

Related Problems

Find fourth proportional to 180.08, 270.11 and 64.52
Half scale
Find fourth proportional to 720.30, 1,080.42 and 258.09
Double scale
Find fourth proportional to 361.15, 541.71 and 130.05
Similar ratio
Find fourth proportional to 540.23, 810.32 and 193.57
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.