Finding the Fourth Proportional to 482.40, 721.68 and 430.44
Calculator
Solution
The fourth proportional to 482.40, 721.68 and 430.44 is: 643.95
Step by Step Solution
- Step 1: Write the proportion equation
482.40 : 721.68 = 430.44 : x - Step 2: Convert to fraction form
482.40/721.68 = 430.44/x - Step 3: Cross multiply
482.40x = 721.68 × 430.44 - Step 4: Simplify right side
482.40x = 310,639.94 - Step 5: Solve for x
x = 310,639.94/482.40 - Step 6: Final answer
x = 643.95
Related Problems
Find fourth proportional to 241.20, 360.84 and 215.22
Half scale
Find fourth proportional to 964.80, 1,443.36 and 860.88
Double scale
Find fourth proportional to 483.40, 723.18 and 431.44
Similar ratio
Find fourth proportional to 723.60, 1,082.52 and 645.66
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.