Finding the Fourth Proportional to 418.44, 627.74 and 129.81
Calculator
Solution
The fourth proportional to 418.44, 627.74 and 129.81 is: 194.74
Step by Step Solution
- Step 1: Write the proportion equation
418.44 : 627.74 = 129.81 : x - Step 2: Convert to fraction form
418.44/627.74 = 129.81/x - Step 3: Cross multiply
418.44x = 627.74 × 129.81 - Step 4: Simplify right side
418.44x = 81,486.93 - Step 5: Solve for x
x = 81,486.93/418.44 - Step 6: Final answer
x = 194.74
Related Problems
Find fourth proportional to 209.22, 313.87 and 64.91
Half scale
Find fourth proportional to 836.88, 1,255.48 and 259.62
Double scale
Find fourth proportional to 419.44, 629.24 and 130.81
Similar ratio
Find fourth proportional to 627.66, 941.61 and 194.72
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.