Finding the Fourth Proportional to 421.26, 631.75 and 177.74
Calculator
Solution
The fourth proportional to 421.26, 631.75 and 177.74 is: 266.55
Step by Step Solution
- Step 1: Write the proportion equation
421.26 : 631.75 = 177.74 : x - Step 2: Convert to fraction form
421.26/631.75 = 177.74/x - Step 3: Cross multiply
421.26x = 631.75 × 177.74 - Step 4: Simplify right side
421.26x = 112,287.25 - Step 5: Solve for x
x = 112,287.25/421.26 - Step 6: Final answer
x = 266.55
Related Problems
Find fourth proportional to 210.63, 315.88 and 88.87
Half scale
Find fourth proportional to 842.52, 1,263.50 and 355.48
Double scale
Find fourth proportional to 422.26, 633.25 and 178.74
Similar ratio
Find fourth proportional to 631.89, 947.63 and 266.61
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.