Finding the Fourth Proportional to 128,131.80, 192,197.70 and 81,475.80
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Solution
The fourth proportional to 128,131.80, 192,197.70 and 81,475.80 is: 122,213.70
Step by Step Solution
- Step 1: Write the proportion equation
128,131.80 : 192,197.70 = 81,475.80 : x - Step 2: Convert to fraction form
128,131.80/192,197.70 = 81,475.80/x - Step 3: Cross multiply
128,131.80x = 192,197.70 × 81,475.80 - Step 4: Simplify right side
128,131.80x = 15,659,461,365.66 - Step 5: Solve for x
x = 15,659,461,365.66/128,131.80 - Step 6: Final answer
x = 122,213.70
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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.