Finding the Fourth Proportional to 422.21, 628.58 and 420.19
Calculator
Solution
The fourth proportional to 422.21, 628.58 and 420.19 is: 625.57
Step by Step Solution
- Step 1: Write the proportion equation
422.21 : 628.58 = 420.19 : x - Step 2: Convert to fraction form
422.21/628.58 = 420.19/x - Step 3: Cross multiply
422.21x = 628.58 × 420.19 - Step 4: Simplify right side
422.21x = 264,122.51 - Step 5: Solve for x
x = 264,122.51/422.21 - Step 6: Final answer
x = 625.57
Related Problems
Find fourth proportional to 211.11, 314.29 and 210.09
Half scale
Find fourth proportional to 844.43, 1,257.17 and 840.38
Double scale
Find fourth proportional to 423.21, 630.07 and 421.19
Similar ratio
Find fourth proportional to 633.32, 942.87 and 630.28
1.5x scale
Why These Related Problems?
These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.