Finding the Fourth Proportional to 86.98, 129.50 and 86.02
Calculator
Solution
The fourth proportional to 86.98, 129.50 and 86.02 is: 128.07
Step by Step Solution
- Step 1: Write the proportion equation
86.98 : 129.50 = 86.02 : x - Step 2: Convert to fraction form
86.98/129.50 = 86.02/x - Step 3: Cross multiply
86.98x = 129.50 × 86.02 - Step 4: Simplify right side
86.98x = 11,139.59 - Step 5: Solve for x
x = 11,139.59/86.98 - Step 6: Final answer
x = 128.07
Related Problems
Find fourth proportional to 43.49, 64.75 and 43.01
Half scale
Find fourth proportional to 173.96, 259 and 172.04
Double scale
Find fourth proportional to 87.98, 130.99 and 87.02
Similar ratio
Find fourth proportional to 130.47, 194.25 and 129.03
1.5x scale
Why These Related Problems?
These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.