Finding the Fourth Proportional to 66,921.99, 100,378.29 and 31,391.10
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Solution
The fourth proportional to 66,921.99, 100,378.29 and 31,391.10 is: 47,084.45
Step by Step Solution
- Step 1: Write the proportion equation
66,921.99 : 100,378.29 = 31,391.10 : x - Step 2: Convert to fraction form
66,921.99/100,378.29 = 31,391.10/x - Step 3: Cross multiply
66,921.99x = 100,378.29 × 31,391.10 - Step 4: Simplify right side
66,921.99x = 3,150,984,939.22 - Step 5: Solve for x
x = 3,150,984,939.22/66,921.99 - Step 6: Final answer
x = 47,084.45
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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.