Finding the Fourth Proportional to 81,981.14, 113,186.21 and 66,909.75
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Solution
The fourth proportional to 81,981.14, 113,186.21 and 66,909.75 is: 92,378.09
Step by Step Solution
- Step 1: Write the proportion equation
81,981.14 : 113,186.21 = 66,909.75 : x - Step 2: Convert to fraction form
81,981.14/113,186.21 = 66,909.75/x - Step 3: Cross multiply
81,981.14x = 113,186.21 × 66,909.75 - Step 4: Simplify right side
81,981.14x = 7,573,260,680.00 - Step 5: Solve for x
x = 7,573,260,680.00/81,981.14 - Step 6: Final answer
x = 92,378.09
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1.5x scale
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.