Home / 54.80-75.60-40.20

Finding the Fourth Proportional to 54.80, 75.60 and 40.20

Calculator

Solution

The fourth proportional to 54.80, 75.60 and 40.20 is: 55.46

Step by Step Solution

  1. Step 1: Write the proportion equation
    54.80 : 75.60 = 40.20 : x
  2. Step 2: Convert to fraction form
    54.80/75.60 = 40.20/x
  3. Step 3: Cross multiply
    54.80x = 75.60 × 40.20
  4. Step 4: Simplify right side
    54.80x = 3,039.12
  5. Step 5: Solve for x
    x = 3,039.12/54.80
  6. Step 6: Final answer
    x = 55.46

Related Problems

Find fourth proportional to 27.40, 37.80 and 20.10
Half scale
Find fourth proportional to 109.60, 151.20 and 80.40
Double scale
Find fourth proportional to 55.80, 76.98 and 41.20
Similar ratio
Find fourth proportional to 82.20, 113.40 and 60.30
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.