Finding the Fourth Proportional to 128,414.20, 192,621.30 and 86,423.80
Calculator
Solution
The fourth proportional to 128,414.20, 192,621.30 and 86,423.80 is: 129,635.70
Step by Step Solution
- Step 1: Write the proportion equation
128,414.20 : 192,621.30 = 86,423.80 : x - Step 2: Convert to fraction form
128,414.20/192,621.30 = 86,423.80/x - Step 3: Cross multiply
128,414.20x = 192,621.30 × 86,423.80 - Step 4: Simplify right side
128,414.20x = 16,647,064,706.94 - Step 5: Solve for x
x = 16,647,064,706.94/128,414.20 - Step 6: Final answer
x = 129,635.70
Related Problems
Find fourth proportional to 64,207.10, 96,310.65 and 43,211.90
Half scale
Find fourth proportional to 256,828.40, 385,242.60 and 172,847.60
Double scale
Find fourth proportional to 128,415.20, 192,622.80 and 86,424.80
Similar ratio
Find fourth proportional to 192,621.30, 288,931.95 and 129,635.70
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.