Home / 263.80-395.68-81.18

Finding the Fourth Proportional to 263.80, 395.68 and 81.18

Calculator

Solution

The fourth proportional to 263.80, 395.68 and 81.18 is: 121.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    263.80 : 395.68 = 81.18 : x
  2. Step 2: Convert to fraction form
    263.80/395.68 = 81.18/x
  3. Step 3: Cross multiply
    263.80x = 395.68 × 81.18
  4. Step 4: Simplify right side
    263.80x = 32,121.30
  5. Step 5: Solve for x
    x = 32,121.30/263.80
  6. Step 6: Final answer
    x = 121.76

Related Problems

Find fourth proportional to 131.90, 197.84 and 40.59
Half scale
Find fourth proportional to 527.60, 791.36 and 162.36
Double scale
Find fourth proportional to 264.80, 397.18 and 82.18
Similar ratio
Find fourth proportional to 395.70, 593.52 and 121.77
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.