Finding the Fourth Proportional to 142,378.20, 196,486.01 and 78,720.09
Calculator
Solution
The fourth proportional to 142,378.20, 196,486.01 and 78,720.09 is: 108,635.99
Step by Step Solution
- Step 1: Write the proportion equation
142,378.20 : 196,486.01 = 78,720.09 : x - Step 2: Convert to fraction form
142,378.20/196,486.01 = 78,720.09/x - Step 3: Cross multiply
142,378.20x = 196,486.01 × 78,720.09 - Step 4: Simplify right side
142,378.20x = 15,467,396,390.94 - Step 5: Solve for x
x = 15,467,396,390.94/142,378.20 - Step 6: Final answer
x = 108,635.99
Related Problems
Find fourth proportional to 71,189.10, 98,243.01 and 39,360.05
Half scale
Find fourth proportional to 284,756.40, 392,972.02 and 157,440.18
Double scale
Find fourth proportional to 142,379.20, 196,487.39 and 78,721.09
Similar ratio
Find fourth proportional to 213,567.30, 294,729.02 and 118,080.14
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.