Finding the Fourth Proportional to 128,839.60, 193,405.20 and 76,278.70
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Solution
The fourth proportional to 128,839.60, 193,405.20 and 76,278.70 is: 114,504.37
Step by Step Solution
- Step 1: Write the proportion equation
128,839.60 : 193,405.20 = 76,278.70 : x - Step 2: Convert to fraction form
128,839.60/193,405.20 = 76,278.70/x - Step 3: Cross multiply
128,839.60x = 193,405.20 × 76,278.70 - Step 4: Simplify right side
128,839.60x = 14,752,697,229.24 - Step 5: Solve for x
x = 14,752,697,229.24/128,839.60 - Step 6: Final answer
x = 114,504.37
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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.