Finding the Fourth Proportional to 429.63, 643.36 and 393.99
Calculator
Solution
The fourth proportional to 429.63, 643.36 and 393.99 is: 589.99
Step by Step Solution
- Step 1: Write the proportion equation
429.63 : 643.36 = 393.99 : x - Step 2: Convert to fraction form
429.63/643.36 = 393.99/x - Step 3: Cross multiply
429.63x = 643.36 × 393.99 - Step 4: Simplify right side
429.63x = 253,477.41 - Step 5: Solve for x
x = 253,477.41/429.63 - Step 6: Final answer
x = 589.99
Related Problems
Find fourth proportional to 214.82, 321.68 and 197.00
Half scale
Find fourth proportional to 859.26, 1,286.72 and 787.98
Double scale
Find fourth proportional to 430.63, 644.86 and 394.99
Similar ratio
Find fourth proportional to 644.45, 965.04 and 590.99
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.