Home / 37.81-56.72-19.78

Finding the Fourth Proportional to 37.81, 56.72 and 19.78

Calculator

Solution

The fourth proportional to 37.81, 56.72 and 19.78 is: 29.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    37.81 : 56.72 = 19.78 : x
  2. Step 2: Convert to fraction form
    37.81/56.72 = 19.78/x
  3. Step 3: Cross multiply
    37.81x = 56.72 × 19.78
  4. Step 4: Simplify right side
    37.81x = 1,121.92
  5. Step 5: Solve for x
    x = 1,121.92/37.81
  6. Step 6: Final answer
    x = 29.67

Related Problems

Find fourth proportional to 18.91, 28.36 and 9.89
Half scale
Find fourth proportional to 75.62, 113.44 and 39.56
Double scale
Find fourth proportional to 38.81, 58.22 and 20.78
Similar ratio
Find fourth proportional to 56.72, 85.08 and 29.67
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.