Finding the Fourth Proportional to 420.36, 630.18 and 163.92
Calculator
Solution
The fourth proportional to 420.36, 630.18 and 163.92 is: 245.74
Step by Step Solution
- Step 1: Write the proportion equation
420.36 : 630.18 = 163.92 : x - Step 2: Convert to fraction form
420.36/630.18 = 163.92/x - Step 3: Cross multiply
420.36x = 630.18 × 163.92 - Step 4: Simplify right side
420.36x = 103,299.11 - Step 5: Solve for x
x = 103,299.11/420.36 - Step 6: Final answer
x = 245.74
Related Problems
Find fourth proportional to 210.18, 315.09 and 81.96
Half scale
Find fourth proportional to 840.72, 1,260.36 and 327.84
Double scale
Find fourth proportional to 421.36, 631.68 and 164.92
Similar ratio
Find fourth proportional to 630.54, 945.27 and 245.88
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.