Finding the Fourth Proportional to 128,145.21, 192,236.19 and 39,406.20
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Solution
The fourth proportional to 128,145.21, 192,236.19 and 39,406.20 is: 59,114.95
Step by Step Solution
- Step 1: Write the proportion equation
128,145.21 : 192,236.19 = 39,406.20 : x - Step 2: Convert to fraction form
128,145.21/192,236.19 = 39,406.20/x - Step 3: Cross multiply
128,145.21x = 192,236.19 × 39,406.20 - Step 4: Simplify right side
128,145.21x = 7,575,297,750.38 - Step 5: Solve for x
x = 7,575,297,750.38/128,145.21 - Step 6: Final answer
x = 59,114.95
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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.