Finding the Fourth Proportional to 991.70, 1,368.57 and 549.63
Calculator
Solution
The fourth proportional to 991.70, 1,368.57 and 549.63 is: 758.51
Step by Step Solution
- Step 1: Write the proportion equation
991.70 : 1,368.57 = 549.63 : x - Step 2: Convert to fraction form
991.70/1,368.57 = 549.63/x - Step 3: Cross multiply
991.70x = 1,368.57 × 549.63 - Step 4: Simplify right side
991.70x = 752,207.13 - Step 5: Solve for x
x = 752,207.13/991.70 - Step 6: Final answer
x = 758.51
Related Problems
Find fourth proportional to 495.85, 684.29 and 274.82
Half scale
Find fourth proportional to 1,983.39, 2,737.14 and 1,099.26
Double scale
Find fourth proportional to 992.70, 1,369.95 and 550.63
Similar ratio
Find fourth proportional to 1,487.54, 2,052.86 and 824.45
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.