Finding the Fourth Proportional to 86,991.28, 120,105.78 and 66,812.09
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Solution
The fourth proportional to 86,991.28, 120,105.78 and 66,812.09 is: 92,245.09
Step by Step Solution
- Step 1: Write the proportion equation
86,991.28 : 120,105.78 = 66,812.09 : x - Step 2: Convert to fraction form
86,991.28/120,105.78 = 66,812.09/x - Step 3: Cross multiply
86,991.28x = 120,105.78 × 66,812.09 - Step 4: Simplify right side
86,991.28x = 8,024,518,182.88 - Step 5: Solve for x
x = 8,024,518,182.88/86,991.28 - Step 6: Final answer
x = 92,245.09
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Why These Related Problems?
These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.