Finding the Fourth Proportional to 128,641.28, 177,589.12 and 80,920.96
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Solution
The fourth proportional to 128,641.28, 177,589.12 and 80,920.96 is: 111,711.28
Step by Step Solution
- Step 1: Write the proportion equation
128,641.28 : 177,589.12 = 80,920.96 : x - Step 2: Convert to fraction form
128,641.28/177,589.12 = 80,920.96/x - Step 3: Cross multiply
128,641.28x = 177,589.12 × 80,920.96 - Step 4: Simplify right side
128,641.28x = 14,370,682,075.96 - Step 5: Solve for x
x = 14,370,682,075.96/128,641.28 - Step 6: Final answer
x = 111,711.28
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Why These Related Problems?
These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.