Finding the Fourth Proportional to 379.13, 568.70 and 135.65
Calculator
Solution
The fourth proportional to 379.13, 568.70 and 135.65 is: 203.47
Step by Step Solution
- Step 1: Write the proportion equation
379.13 : 568.70 = 135.65 : x - Step 2: Convert to fraction form
379.13/568.70 = 135.65/x - Step 3: Cross multiply
379.13x = 568.70 × 135.65 - Step 4: Simplify right side
379.13x = 77,140.63 - Step 5: Solve for x
x = 77,140.63/379.13 - Step 6: Final answer
x = 203.47
Related Problems
Find fourth proportional to 189.56, 284.35 and 67.82
Half scale
Find fourth proportional to 758.25, 1,137.39 and 271.29
Double scale
Find fourth proportional to 380.13, 570.20 and 136.65
Similar ratio
Find fourth proportional to 568.69, 853.04 and 203.47
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.