Finding the Fourth Proportional to 128,816.80, 177,767.26 and 78,515.80
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Solution
The fourth proportional to 128,816.80, 177,767.26 and 78,515.80 is: 108,351.85
Step by Step Solution
- Step 1: Write the proportion equation
128,816.80 : 177,767.26 = 78,515.80 : x - Step 2: Convert to fraction form
128,816.80/177,767.26 = 78,515.80/x - Step 3: Cross multiply
128,816.80x = 177,767.26 × 78,515.80 - Step 4: Simplify right side
128,816.80x = 13,957,538,632.71 - Step 5: Solve for x
x = 13,957,538,632.71/128,816.80 - Step 6: Final answer
x = 108,351.85
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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.