Finding the Fourth Proportional to 128,812.20, 193,218.30 and 86,821.80
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Solution
The fourth proportional to 128,812.20, 193,218.30 and 86,821.80 is: 130,232.70
Step by Step Solution
- Step 1: Write the proportion equation
128,812.20 : 193,218.30 = 86,821.80 : x - Step 2: Convert to fraction form
128,812.20/193,218.30 = 86,821.80/x - Step 3: Cross multiply
128,812.20x = 193,218.30 × 86,821.80 - Step 4: Simplify right side
128,812.20x = 16,775,560,598.94 - Step 5: Solve for x
x = 16,775,560,598.94/128,812.20 - Step 6: Final answer
x = 130,232.70
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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.