Finding the Fourth Proportional to 143.19, 214.60 and 74.70
Calculator
Solution
The fourth proportional to 143.19, 214.60 and 74.70 is: 111.95
Step by Step Solution
- Step 1: Write the proportion equation
143.19 : 214.60 = 74.70 : x - Step 2: Convert to fraction form
143.19/214.60 = 74.70/x - Step 3: Cross multiply
143.19x = 214.60 × 74.70 - Step 4: Simplify right side
143.19x = 16,029.97 - Step 5: Solve for x
x = 16,029.97/143.19 - Step 6: Final answer
x = 111.95
Related Problems
Find fourth proportional to 71.60, 107.30 and 37.35
Half scale
Find fourth proportional to 286.39, 429.20 and 149.39
Double scale
Find fourth proportional to 144.19, 216.10 and 75.70
Similar ratio
Find fourth proportional to 214.79, 321.90 and 112.05
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.