Finding the Fourth Proportional to 398.21, 548.84 and 299.79
Calculator
Solution
The fourth proportional to 398.21, 548.84 and 299.79 is: 413.19
Step by Step Solution
- Step 1: Write the proportion equation
398.21 : 548.84 = 299.79 : x - Step 2: Convert to fraction form
398.21/548.84 = 299.79/x - Step 3: Cross multiply
398.21x = 548.84 × 299.79 - Step 4: Simplify right side
398.21x = 164,535.24 - Step 5: Solve for x
x = 164,535.24/398.21 - Step 6: Final answer
x = 413.19
Related Problems
Find fourth proportional to 199.10, 274.42 and 149.90
Half scale
Find fourth proportional to 796.41, 1,097.67 and 599.58
Double scale
Find fourth proportional to 399.21, 550.21 and 300.79
Similar ratio
Find fourth proportional to 597.31, 823.25 and 449.69
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.