Finding the Fourth Proportional to 128,676.40, 193,187.40 and 82,135.60
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Solution
The fourth proportional to 128,676.40, 193,187.40 and 82,135.60 is: 123,313.70
Step by Step Solution
- Step 1: Write the proportion equation
128,676.40 : 193,187.40 = 82,135.60 : x - Step 2: Convert to fraction form
128,676.40/193,187.40 = 82,135.60/x - Step 3: Cross multiply
128,676.40x = 193,187.40 × 82,135.60 - Step 4: Simplify right side
128,676.40x = 15,867,563,011.44 - Step 5: Solve for x
x = 15,867,563,011.44/128,676.40 - Step 6: Final answer
x = 123,313.70
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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.