Finding the Fourth Proportional to 128,783,381.63, 177,704,936.24 and 87,058,232.69
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Solution
The fourth proportional to 128,783,381.63, 177,704,936.24 and 87,058,232.69 is: 120,129,456.87
Step by Step Solution
- Step 1: Write the proportion equation
128,783,381.63 : 177,704,936.24 = 87,058,232.69 : x - Step 2: Convert to fraction form
128,783,381.63/177,704,936.24 = 87,058,232.69/x - Step 3: Cross multiply
128,783,381.63x = 177,704,936.24 × 87,058,232.69 - Step 4: Simplify right side
128,783,381.63x = 15,470,677,688,019,720 - Step 5: Solve for x
x = 15,470,677,688,019,720/128,783,381.63 - Step 6: Final answer
x = 120,129,456.87
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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.