Finding the Fourth Proportional to 427,991.40, 641,985.58 and 128,470.68
Calculator
Solution
The fourth proportional to 427,991.40, 641,985.58 and 128,470.68 is: 192,705.56
Step by Step Solution
- Step 1: Write the proportion equation
427,991.40 : 641,985.58 = 128,470.68 : x - Step 2: Convert to fraction form
427,991.40/641,985.58 = 128,470.68/x - Step 3: Cross multiply
427,991.40x = 641,985.58 × 128,470.68 - Step 4: Simplify right side
427,991.40x = 82,476,324,012.79 - Step 5: Solve for x
x = 82,476,324,012.79/427,991.40 - Step 6: Final answer
x = 192,705.56
Related Problems
Find fourth proportional to 213,995.70, 320,992.79 and 64,235.34
Half scale
Find fourth proportional to 855,982.80, 1,283,971.16 and 256,941.36
Double scale
Find fourth proportional to 427,992.40, 641,987.08 and 128,471.68
Similar ratio
Find fourth proportional to 641,987.10, 962,978.37 and 192,706.02
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.