Finding the Fourth Proportional to 681.18, 939.99 and 419.19
Calculator
Solution
The fourth proportional to 681.18, 939.99 and 419.19 is: 578.46
Step by Step Solution
- Step 1: Write the proportion equation
681.18 : 939.99 = 419.19 : x - Step 2: Convert to fraction form
681.18/939.99 = 419.19/x - Step 3: Cross multiply
681.18x = 939.99 × 419.19 - Step 4: Simplify right side
681.18x = 394,034.41 - Step 5: Solve for x
x = 394,034.41/681.18 - Step 6: Final answer
x = 578.46
Related Problems
Find fourth proportional to 340.59, 470.00 and 209.60
Half scale
Find fourth proportional to 1,362.36, 1,879.98 and 838.38
Double scale
Find fourth proportional to 682.18, 941.37 and 420.19
Similar ratio
Find fourth proportional to 1,021.77, 1,409.99 and 628.79
1.5x scale
Why These Related Problems?
These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.