Finding the Fourth Proportional to 210.99, 290.70 and 161.70
Calculator
Solution
The fourth proportional to 210.99, 290.70 and 161.70 is: 222.79
Step by Step Solution
- Step 1: Write the proportion equation
210.99 : 290.70 = 161.70 : x - Step 2: Convert to fraction form
210.99/290.70 = 161.70/x - Step 3: Cross multiply
210.99x = 290.70 × 161.70 - Step 4: Simplify right side
210.99x = 47,006.19 - Step 5: Solve for x
x = 47,006.19/210.99 - Step 6: Final answer
x = 222.79
Related Problems
Find fourth proportional to 105.50, 145.35 and 80.85
Half scale
Find fourth proportional to 421.98, 581.40 and 323.40
Double scale
Find fourth proportional to 211.99, 292.08 and 162.70
Similar ratio
Find fourth proportional to 316.49, 436.05 and 242.55
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.