Finding the Fourth Proportional to 1,419.68, 2,129.84 and 554
Calculator
Solution
The fourth proportional to 1,419.68, 2,129.84 and 554 is: 831.12
Step by Step Solution
- Step 1: Write the proportion equation
1,419.68 : 2,129.84 = 554 : x - Step 2: Convert to fraction form
1,419.68/2,129.84 = 554/x - Step 3: Cross multiply
1,419.68x = 2,129.84 × 554 - Step 4: Simplify right side
1,419.68x = 1,179,928.59 - Step 5: Solve for x
x = 1,179,928.59/1,419.68 - Step 6: Final answer
x = 831.12
Related Problems
Find fourth proportional to 709.84, 1,064.92 and 277
Half scale
Find fourth proportional to 2,839.36, 4,259.67 and 1,108
Double scale
Find fourth proportional to 1,420.68, 2,131.34 and 555
Similar ratio
Find fourth proportional to 2,129.52, 3,194.75 and 831
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.