Finding the Fourth Proportional to 258.35, 387.51 and 84.99
Calculator
Solution
The fourth proportional to 258.35, 387.51 and 84.99 is: 127.48
Step by Step Solution
- Step 1: Write the proportion equation
258.35 : 387.51 = 84.99 : x - Step 2: Convert to fraction form
258.35/387.51 = 84.99/x - Step 3: Cross multiply
258.35x = 387.51 × 84.99 - Step 4: Simplify right side
258.35x = 32,934.47 - Step 5: Solve for x
x = 32,934.47/258.35 - Step 6: Final answer
x = 127.48
Related Problems
Find fourth proportional to 129.17, 193.76 and 42.50
Half scale
Find fourth proportional to 516.70, 775.02 and 169.98
Double scale
Find fourth proportional to 259.35, 389.01 and 85.99
Similar ratio
Find fourth proportional to 387.52, 581.27 and 127.49
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.