Finding the Fourth Proportional to 990.24, 1,366.08 and 576
Calculator
Solution
The fourth proportional to 990.24, 1,366.08 and 576 is: 794.62
Step by Step Solution
- Step 1: Write the proportion equation
990.24 : 1,366.08 = 576 : x - Step 2: Convert to fraction form
990.24/1,366.08 = 576/x - Step 3: Cross multiply
990.24x = 1,366.08 × 576 - Step 4: Simplify right side
990.24x = 786,862.08 - Step 5: Solve for x
x = 786,862.08/990.24 - Step 6: Final answer
x = 794.62
Related Problems
Find fourth proportional to 495.12, 683.04 and 288
Half scale
Find fourth proportional to 1,980.48, 2,732.16 and 1,152
Double scale
Find fourth proportional to 991.24, 1,367.46 and 577
Similar ratio
Find fourth proportional to 1,485.36, 2,049.12 and 864
1.5x scale
Why These Related Problems?
These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.