Finding the Fourth Proportional to 438.91, 657.88 and 317.70
Calculator
Solution
The fourth proportional to 438.91, 657.88 and 317.70 is: 476.20
Step by Step Solution
- Step 1: Write the proportion equation
438.91 : 657.88 = 317.70 : x - Step 2: Convert to fraction form
438.91/657.88 = 317.70/x - Step 3: Cross multiply
438.91x = 657.88 × 317.70 - Step 4: Simplify right side
438.91x = 209,007.68 - Step 5: Solve for x
x = 209,007.68/438.91 - Step 6: Final answer
x = 476.20
Related Problems
Find fourth proportional to 219.45, 328.94 and 158.85
Half scale
Find fourth proportional to 877.82, 1,315.76 and 635.40
Double scale
Find fourth proportional to 439.91, 659.38 and 318.70
Similar ratio
Find fourth proportional to 658.36, 986.82 and 476.55
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.