Finding the Fourth Proportional to 129,630.99, 178,905.20 and 81,882.03
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Solution
The fourth proportional to 129,630.99, 178,905.20 and 81,882.03 is: 113,006.32
Step by Step Solution
- Step 1: Write the proportion equation
129,630.99 : 178,905.20 = 81,882.03 : x - Step 2: Convert to fraction form
129,630.99/178,905.20 = 81,882.03/x - Step 3: Cross multiply
129,630.99x = 178,905.20 × 81,882.03 - Step 4: Simplify right side
129,630.99x = 14,649,120,544.15 - Step 5: Solve for x
x = 14,649,120,544.15/129,630.99 - Step 6: Final answer
x = 113,006.32
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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.