Home / 94.80-142.24-85.76

Finding the Fourth Proportional to 94.80, 142.24 and 85.76

Calculator

Solution

The fourth proportional to 94.80, 142.24 and 85.76 is: 128.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    94.80 : 142.24 = 85.76 : x
  2. Step 2: Convert to fraction form
    94.80/142.24 = 85.76/x
  3. Step 3: Cross multiply
    94.80x = 142.24 × 85.76
  4. Step 4: Simplify right side
    94.80x = 12,198.50
  5. Step 5: Solve for x
    x = 12,198.50/94.80
  6. Step 6: Final answer
    x = 128.68

Related Problems

Find fourth proportional to 47.40, 71.12 and 42.88
Half scale
Find fourth proportional to 189.60, 284.48 and 171.52
Double scale
Find fourth proportional to 95.80, 143.74 and 86.76
Similar ratio
Find fourth proportional to 142.20, 213.36 and 128.64
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.