Home / 154.26-231.39-90

Finding the Fourth Proportional to 154.26, 231.39 and 90

Calculator

Solution

The fourth proportional to 154.26, 231.39 and 90 is: 135

Step by Step Solution

  1. Step 1: Write the proportion equation
    154.26 : 231.39 = 90 : x
  2. Step 2: Convert to fraction form
    154.26/231.39 = 90/x
  3. Step 3: Cross multiply
    154.26x = 231.39 × 90
  4. Step 4: Simplify right side
    154.26x = 20,825.10
  5. Step 5: Solve for x
    x = 20,825.10/154.26
  6. Step 6: Final answer
    x = 135

Related Problems

Find fourth proportional to 77.13, 115.70 and 45
Half scale
Find fourth proportional to 308.52, 462.78 and 180
Double scale
Find fourth proportional to 155.26, 232.89 and 91
Similar ratio
Find fourth proportional to 231.39, 347.09 and 135
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.