Finding the Fourth Proportional to 221.64, 306.18 and 208.08
Calculator
Solution
The fourth proportional to 221.64, 306.18 and 208.08 is: 287.45
Step by Step Solution
- Step 1: Write the proportion equation
221.64 : 306.18 = 208.08 : x - Step 2: Convert to fraction form
221.64/306.18 = 208.08/x - Step 3: Cross multiply
221.64x = 306.18 × 208.08 - Step 4: Simplify right side
221.64x = 63,709.93 - Step 5: Solve for x
x = 63,709.93/221.64 - Step 6: Final answer
x = 287.45
Related Problems
Find fourth proportional to 110.82, 153.09 and 104.04
Half scale
Find fourth proportional to 443.28, 612.36 and 416.16
Double scale
Find fourth proportional to 222.64, 307.56 and 209.08
Similar ratio
Find fourth proportional to 332.46, 459.27 and 312.12
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.