Finding the Fourth Proportional to 339.05, 508.39 and 143.99
Calculator
Solution
The fourth proportional to 339.05, 508.39 and 143.99 is: 215.91
Step by Step Solution
- Step 1: Write the proportion equation
339.05 : 508.39 = 143.99 : x - Step 2: Convert to fraction form
339.05/508.39 = 143.99/x - Step 3: Cross multiply
339.05x = 508.39 × 143.99 - Step 4: Simplify right side
339.05x = 73,203.08 - Step 5: Solve for x
x = 73,203.08/339.05 - Step 6: Final answer
x = 215.91
Related Problems
Find fourth proportional to 169.53, 254.20 and 72.00
Half scale
Find fourth proportional to 678.10, 1,016.78 and 287.98
Double scale
Find fourth proportional to 340.05, 509.89 and 144.99
Similar ratio
Find fourth proportional to 508.58, 762.59 and 215.99
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.