Finding the Fourth Proportional to 138,420.70, 207,861.45 and 76,135.90
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Solution
The fourth proportional to 138,420.70, 207,861.45 and 76,135.90 is: 114,330.58
Step by Step Solution
- Step 1: Write the proportion equation
138,420.70 : 207,861.45 = 76,135.90 : x - Step 2: Convert to fraction form
138,420.70/207,861.45 = 76,135.90/x - Step 3: Cross multiply
138,420.70x = 207,861.45 × 76,135.90 - Step 4: Simplify right side
138,420.70x = 15,825,718,571.06 - Step 5: Solve for x
x = 15,825,718,571.06/138,420.70 - Step 6: Final answer
x = 114,330.58
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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.