Finding the Fourth Proportional to 396.64, 547.36 and 221.99
Calculator
Solution
The fourth proportional to 396.64, 547.36 and 221.99 is: 306.35
Step by Step Solution
- Step 1: Write the proportion equation
396.64 : 547.36 = 221.99 : x - Step 2: Convert to fraction form
396.64/547.36 = 221.99/x - Step 3: Cross multiply
396.64x = 547.36 × 221.99 - Step 4: Simplify right side
396.64x = 121,508.45 - Step 5: Solve for x
x = 121,508.45/396.64 - Step 6: Final answer
x = 306.35
Related Problems
Find fourth proportional to 198.32, 273.68 and 111.00
Half scale
Find fourth proportional to 793.27, 1,094.72 and 443.98
Double scale
Find fourth proportional to 397.64, 548.74 and 222.99
Similar ratio
Find fourth proportional to 594.95, 821.04 and 332.99
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.