Finding the Fourth Proportional to 138,629.20, 207,943.80 and 76,421.20
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Solution
The fourth proportional to 138,629.20, 207,943.80 and 76,421.20 is: 114,631.80
Step by Step Solution
- Step 1: Write the proportion equation
138,629.20 : 207,943.80 = 76,421.20 : x - Step 2: Convert to fraction form
138,629.20/207,943.80 = 76,421.20/x - Step 3: Cross multiply
138,629.20x = 207,943.80 × 76,421.20 - Step 4: Simplify right side
138,629.20x = 15,891,314,728.56 - Step 5: Solve for x
x = 15,891,314,728.56/138,629.20 - Step 6: Final answer
x = 114,631.80
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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.