Home / 262.82-394.21-80.21

Finding the Fourth Proportional to 262.82, 394.21 and 80.21

Calculator

Solution

The fourth proportional to 262.82, 394.21 and 80.21 is: 120.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    262.82 : 394.21 = 80.21 : x
  2. Step 2: Convert to fraction form
    262.82/394.21 = 80.21/x
  3. Step 3: Cross multiply
    262.82x = 394.21 × 80.21
  4. Step 4: Simplify right side
    262.82x = 31,619.58
  5. Step 5: Solve for x
    x = 31,619.58/262.82
  6. Step 6: Final answer
    x = 120.31

Related Problems

Find fourth proportional to 131.41, 197.11 and 40.11
Half scale
Find fourth proportional to 525.64, 788.42 and 160.42
Double scale
Find fourth proportional to 263.82, 395.71 and 81.21
Similar ratio
Find fourth proportional to 394.23, 591.32 and 120.32
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.