Finding the Fourth Proportional to 718.56, 991.52 and 408
Calculator
Solution
The fourth proportional to 718.56, 991.52 and 408 is: 562.99
Step by Step Solution
- Step 1: Write the proportion equation
718.56 : 991.52 = 408 : x - Step 2: Convert to fraction form
718.56/991.52 = 408/x - Step 3: Cross multiply
718.56x = 991.52 × 408 - Step 4: Simplify right side
718.56x = 404,540.16 - Step 5: Solve for x
x = 404,540.16/718.56 - Step 6: Final answer
x = 562.99
Related Problems
Find fourth proportional to 359.28, 495.76 and 204
Half scale
Find fourth proportional to 1,437.12, 1,983.04 and 816
Double scale
Find fourth proportional to 719.56, 992.90 and 409
Similar ratio
Find fourth proportional to 1,077.84, 1,487.28 and 612
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.