Finding the Fourth Proportional to 128,783.68, 193,163.20 and 78,838.07
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Solution
The fourth proportional to 128,783.68, 193,163.20 and 78,838.07 is: 118,249.56
Step by Step Solution
- Step 1: Write the proportion equation
128,783.68 : 193,163.20 = 78,838.07 : x - Step 2: Convert to fraction form
128,783.68/193,163.20 = 78,838.07/x - Step 3: Cross multiply
128,783.68x = 193,163.20 × 78,838.07 - Step 4: Simplify right side
128,783.68x = 15,228,612,720.11 - Step 5: Solve for x
x = 15,228,612,720.11/128,783.68 - Step 6: Final answer
x = 118,249.56
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Why These Related Problems?
These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.