Home / 75-103.22-61.78

Finding the Fourth Proportional to 75, 103.22 and 61.78

Calculator

Solution

The fourth proportional to 75, 103.22 and 61.78 is: 85.03

Step by Step Solution

  1. Step 1: Write the proportion equation
    75 : 103.22 = 61.78 : x
  2. Step 2: Convert to fraction form
    75/103.22 = 61.78/x
  3. Step 3: Cross multiply
    75x = 103.22 × 61.78
  4. Step 4: Simplify right side
    75x = 6,376.93
  5. Step 5: Solve for x
    x = 6,376.93/75
  6. Step 6: Final answer
    x = 85.03

Related Problems

Find fourth proportional to 37.50, 51.61 and 30.89
Half scale
Find fourth proportional to 150, 206.44 and 123.56
Double scale
Find fourth proportional to 76, 104.60 and 62.78
Similar ratio
Find fourth proportional to 112.50, 154.83 and 92.67
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.