Finding the Fourth Proportional to 128,379.30, 177,163.77 and 71,790.67
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Solution
The fourth proportional to 128,379.30, 177,163.77 and 71,790.67 is: 99,071.31
Step by Step Solution
- Step 1: Write the proportion equation
128,379.30 : 177,163.77 = 71,790.67 : x - Step 2: Convert to fraction form
128,379.30/177,163.77 = 71,790.67/x - Step 3: Cross multiply
128,379.30x = 177,163.77 × 71,790.67 - Step 4: Simplify right side
128,379.30x = 12,718,705,748.03 - Step 5: Solve for x
x = 12,718,705,748.03/128,379.30 - Step 6: Final answer
x = 99,071.31
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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.