Finding the Fourth Proportional to 81,905,931.92, 122,859,234.12 and 20,494,923.68
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Solution
The fourth proportional to 81,905,931.92, 122,859,234.12 and 20,494,923.68 is: 30,742,469.66
Step by Step Solution
- Step 1: Write the proportion equation
81,905,931.92 : 122,859,234.12 = 20,494,923.68 : x - Step 2: Convert to fraction form
81,905,931.92/122,859,234.12 = 20,494,923.68/x - Step 3: Cross multiply
81,905,931.92x = 122,859,234.12 × 20,494,923.68 - Step 4: Simplify right side
81,905,931.92x = 2,517,990,626,672,652 - Step 5: Solve for x
x = 2,517,990,626,672,652/81,905,931.92 - Step 6: Final answer
x = 30,742,469.66
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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.