Finding the Fourth Proportional to 12.67, 18.99 and 9.99
Calculator
Solution
The fourth proportional to 12.67, 18.99 and 9.99 is: 14.98
Step by Step Solution
- Step 1: Write the proportion equation
12.67 : 18.99 = 9.99 : x - Step 2: Convert to fraction form
12.67/18.99 = 9.99/x - Step 3: Cross multiply
12.67x = 18.99 × 9.99 - Step 4: Simplify right side
12.67x = 189.71 - Step 5: Solve for x
x = 189.71/12.67 - Step 6: Final answer
x = 14.98
Related Problems
Find fourth proportional to 6.33, 9.50 and 5.00
Half scale
Find fourth proportional to 25.34, 37.98 and 19.98
Double scale
Find fourth proportional to 13.67, 20.49 and 10.99
Similar ratio
Find fourth proportional to 19.00, 28.49 and 14.99
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.