Finding the Fourth Proportional to 74.70, 112.14 and 47.70
Calculator
Solution
The fourth proportional to 74.70, 112.14 and 47.70 is: 71.61
Step by Step Solution
- Step 1: Write the proportion equation
74.70 : 112.14 = 47.70 : x - Step 2: Convert to fraction form
74.70/112.14 = 47.70/x - Step 3: Cross multiply
74.70x = 112.14 × 47.70 - Step 4: Simplify right side
74.70x = 5,349.08 - Step 5: Solve for x
x = 5,349.08/74.70 - Step 6: Final answer
x = 71.61
Related Problems
Find fourth proportional to 37.35, 56.07 and 23.85
Half scale
Find fourth proportional to 149.40, 224.28 and 95.40
Double scale
Find fourth proportional to 75.70, 113.64 and 48.70
Similar ratio
Find fourth proportional to 112.05, 168.21 and 71.55
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.