Finding the Fourth Proportional to 128,856.67, 177,821.67 and 72,268.09
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Solution
The fourth proportional to 128,856.67, 177,821.67 and 72,268.09 is: 99,729.66
Step by Step Solution
- Step 1: Write the proportion equation
128,856.67 : 177,821.67 = 72,268.09 : x - Step 2: Convert to fraction form
128,856.67/177,821.67 = 72,268.09/x - Step 3: Cross multiply
128,856.67x = 177,821.67 × 72,268.09 - Step 4: Simplify right side
128,856.67x = 12,850,832,451.51 - Step 5: Solve for x
x = 12,850,832,451.51/128,856.67 - Step 6: Final answer
x = 99,729.66
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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.