Home / 36.80-55.20-27.80

Finding the Fourth Proportional to 36.80, 55.20 and 27.80

Calculator

Solution

The fourth proportional to 36.80, 55.20 and 27.80 is: 41.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    36.80 : 55.20 = 27.80 : x
  2. Step 2: Convert to fraction form
    36.80/55.20 = 27.80/x
  3. Step 3: Cross multiply
    36.80x = 55.20 × 27.80
  4. Step 4: Simplify right side
    36.80x = 1,534.56
  5. Step 5: Solve for x
    x = 1,534.56/36.80
  6. Step 6: Final answer
    x = 41.70

Related Problems

Find fourth proportional to 18.40, 27.60 and 13.90
Half scale
Find fourth proportional to 73.60, 110.40 and 55.60
Double scale
Find fourth proportional to 37.80, 56.70 and 28.80
Similar ratio
Find fourth proportional to 55.20, 82.80 and 41.70
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.