Home / 371.20-512.22-223.78

Finding the Fourth Proportional to 371.20, 512.22 and 223.78

Calculator

Solution

The fourth proportional to 371.20, 512.22 and 223.78 is: 308.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    371.20 : 512.22 = 223.78 : x
  2. Step 2: Convert to fraction form
    371.20/512.22 = 223.78/x
  3. Step 3: Cross multiply
    371.20x = 512.22 × 223.78
  4. Step 4: Simplify right side
    371.20x = 114,624.59
  5. Step 5: Solve for x
    x = 114,624.59/371.20
  6. Step 6: Final answer
    x = 308.79

Related Problems

Find fourth proportional to 185.60, 256.11 and 111.89
Half scale
Find fourth proportional to 742.40, 1,024.44 and 447.56
Double scale
Find fourth proportional to 372.20, 513.60 and 224.78
Similar ratio
Find fourth proportional to 556.80, 768.33 and 335.67
1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.