Finding the Fourth Proportional to 207,912.10, 311,868.15 and 128,769.70
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Solution
The fourth proportional to 207,912.10, 311,868.15 and 128,769.70 is: 193,154.55
Step by Step Solution
- Step 1: Write the proportion equation
207,912.10 : 311,868.15 = 128,769.70 : x - Step 2: Convert to fraction form
207,912.10/311,868.15 = 128,769.70/x - Step 3: Cross multiply
207,912.10x = 311,868.15 × 128,769.70 - Step 4: Simplify right side
207,912.10x = 40,159,168,115.06 - Step 5: Solve for x
x = 40,159,168,115.06/207,912.10 - Step 6: Final answer
x = 193,154.55
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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.