Finding the Fourth Proportional to 128,938.26, 177,935.10 and 71,578.44
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Solution
The fourth proportional to 128,938.26, 177,935.10 and 71,578.44 is: 98,778.41
Step by Step Solution
- Step 1: Write the proportion equation
128,938.26 : 177,935.10 = 71,578.44 : x - Step 2: Convert to fraction form
128,938.26/177,935.10 = 71,578.44/x - Step 3: Cross multiply
128,938.26x = 177,935.10 × 71,578.44 - Step 4: Simplify right side
128,938.26x = 12,736,316,879.24 - Step 5: Solve for x
x = 12,736,316,879.24/128,938.26 - Step 6: Final answer
x = 98,778.41
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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.