Finding the Fourth Proportional to 331.15, 496.99 and 138.91
Calculator
Solution
The fourth proportional to 331.15, 496.99 and 138.91 is: 208.48
Step by Step Solution
- Step 1: Write the proportion equation
331.15 : 496.99 = 138.91 : x - Step 2: Convert to fraction form
331.15/496.99 = 138.91/x - Step 3: Cross multiply
331.15x = 496.99 × 138.91 - Step 4: Simplify right side
331.15x = 69,036.88 - Step 5: Solve for x
x = 69,036.88/331.15 - Step 6: Final answer
x = 208.48
Related Problems
Find fourth proportional to 165.58, 248.50 and 69.46
Half scale
Find fourth proportional to 662.30, 993.98 and 277.82
Double scale
Find fourth proportional to 332.15, 498.49 and 139.91
Similar ratio
Find fourth proportional to 496.73, 745.49 and 208.37
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.