Home / 271.14-406.74-78.78

Finding the Fourth Proportional to 271.14, 406.74 and 78.78

Calculator

Solution

The fourth proportional to 271.14, 406.74 and 78.78 is: 118.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    271.14 : 406.74 = 78.78 : x
  2. Step 2: Convert to fraction form
    271.14/406.74 = 78.78/x
  3. Step 3: Cross multiply
    271.14x = 406.74 × 78.78
  4. Step 4: Simplify right side
    271.14x = 32,042.98
  5. Step 5: Solve for x
    x = 32,042.98/271.14
  6. Step 6: Final answer
    x = 118.18

Related Problems

Find fourth proportional to 135.57, 203.37 and 39.39
Half scale
Find fourth proportional to 542.28, 813.48 and 157.56
Double scale
Find fourth proportional to 272.14, 408.24 and 79.78
Similar ratio
Find fourth proportional to 406.71, 610.11 and 118.17
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.