Finding the Fourth Proportional to 138,680.20, 207,728.70 and 115,352.20
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Solution
The fourth proportional to 138,680.20, 207,728.70 and 115,352.20 is: 172,785.75
Step by Step Solution
- Step 1: Write the proportion equation
138,680.20 : 207,728.70 = 115,352.20 : x - Step 2: Convert to fraction form
138,680.20/207,728.70 = 115,352.20/x - Step 3: Cross multiply
138,680.20x = 207,728.70 × 115,352.20 - Step 4: Simplify right side
138,680.20x = 23,961,962,548.14 - Step 5: Solve for x
x = 23,961,962,548.14/138,680.20 - Step 6: Final answer
x = 172,785.75
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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.