Finding the Fourth Proportional to 84.21, 125.95 and 57.18
Calculator
Solution
The fourth proportional to 84.21, 125.95 and 57.18 is: 85.52
Step by Step Solution
- Step 1: Write the proportion equation
84.21 : 125.95 = 57.18 : x - Step 2: Convert to fraction form
84.21/125.95 = 57.18/x - Step 3: Cross multiply
84.21x = 125.95 × 57.18 - Step 4: Simplify right side
84.21x = 7,201.82 - Step 5: Solve for x
x = 7,201.82/84.21 - Step 6: Final answer
x = 85.52
Related Problems
Find fourth proportional to 42.11, 62.98 and 28.59
Half scale
Find fourth proportional to 168.42, 251.90 and 114.36
Double scale
Find fourth proportional to 85.21, 127.45 and 58.18
Similar ratio
Find fourth proportional to 126.32, 188.93 and 85.77
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.