Home / 95.70-131.99-81.80

Finding the Fourth Proportional to 95.70, 131.99 and 81.80

Calculator

Solution

The fourth proportional to 95.70, 131.99 and 81.80 is: 112.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    95.70 : 131.99 = 81.80 : x
  2. Step 2: Convert to fraction form
    95.70/131.99 = 81.80/x
  3. Step 3: Cross multiply
    95.70x = 131.99 × 81.80
  4. Step 4: Simplify right side
    95.70x = 10,796.67
  5. Step 5: Solve for x
    x = 10,796.67/95.70
  6. Step 6: Final answer
    x = 112.81

Related Problems

Find fourth proportional to 47.85, 66.00 and 40.90
Half scale
Find fourth proportional to 191.41, 263.98 and 163.60
Double scale
Find fourth proportional to 96.70, 133.37 and 82.80
Similar ratio
Find fourth proportional to 143.56, 197.99 and 122.70
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.