Finding the Fourth Proportional to 83.21, 124.82 and 29.09
Calculator
Solution
The fourth proportional to 83.21, 124.82 and 29.09 is: 43.64
Step by Step Solution
- Step 1: Write the proportion equation
83.21 : 124.82 = 29.09 : x - Step 2: Convert to fraction form
83.21/124.82 = 29.09/x - Step 3: Cross multiply
83.21x = 124.82 × 29.09 - Step 4: Simplify right side
83.21x = 3,631.40 - Step 5: Solve for x
x = 3,631.40/83.21 - Step 6: Final answer
x = 43.64
Related Problems
Find fourth proportional to 41.60, 62.41 and 14.55
Half scale
Find fourth proportional to 166.41, 249.65 and 58.19
Double scale
Find fourth proportional to 84.21, 126.32 and 30.09
Similar ratio
Find fourth proportional to 124.81, 187.23 and 43.64
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.