Finding the Fourth Proportional to 128,921.12, 177,912.64 and 77,936.64
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Solution
The fourth proportional to 128,921.12, 177,912.64 and 77,936.64 is: 107,553.47
Step by Step Solution
- Step 1: Write the proportion equation
128,921.12 : 177,912.64 = 77,936.64 : x - Step 2: Convert to fraction form
128,921.12/177,912.64 = 77,936.64/x - Step 3: Cross multiply
128,921.12x = 177,912.64 × 77,936.64 - Step 4: Simplify right side
128,921.12x = 13,865,913,375.13 - Step 5: Solve for x
x = 13,865,913,375.13/128,921.12 - Step 6: Final answer
x = 107,553.47
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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.