Finding the Fourth Proportional to 128,920.09, 177,906.97 and 71,556.07
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Solution
The fourth proportional to 128,920.09, 177,906.97 and 71,556.07 is: 98,745.85
Step by Step Solution
- Step 1: Write the proportion equation
128,920.09 : 177,906.97 = 71,556.07 : x - Step 2: Convert to fraction form
128,920.09/177,906.97 = 71,556.07/x - Step 3: Cross multiply
128,920.09x = 177,906.97 × 71,556.07 - Step 4: Simplify right side
128,920.09x = 12,730,323,598.81 - Step 5: Solve for x
x = 12,730,323,598.81/128,920.09 - Step 6: Final answer
x = 98,745.85
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1.5x scale
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.