Finding the Fourth Proportional to 386.40, 579.68 and 170.08
Calculator
Solution
The fourth proportional to 386.40, 579.68 and 170.08 is: 255.16
Step by Step Solution
- Step 1: Write the proportion equation
386.40 : 579.68 = 170.08 : x - Step 2: Convert to fraction form
386.40/579.68 = 170.08/x - Step 3: Cross multiply
386.40x = 579.68 × 170.08 - Step 4: Simplify right side
386.40x = 98,591.97 - Step 5: Solve for x
x = 98,591.97/386.40 - Step 6: Final answer
x = 255.16
Related Problems
Find fourth proportional to 193.20, 289.84 and 85.04
Half scale
Find fourth proportional to 772.80, 1,159.36 and 340.16
Double scale
Find fourth proportional to 387.40, 581.18 and 171.08
Similar ratio
Find fourth proportional to 579.60, 869.52 and 255.12
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.