Finding the Fourth Proportional to 99,639,993.80, 149,459,990.70 and 72,430,214.60
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Solution
The fourth proportional to 99,639,993.80, 149,459,990.70 and 72,430,214.60 is: 108,645,321.90
Step by Step Solution
- Step 1: Write the proportion equation
99,639,993.80 : 149,459,990.70 = 72,430,214.60 : x - Step 2: Convert to fraction form
99,639,993.80/149,459,990.70 = 72,430,214.60/x - Step 3: Cross multiply
99,639,993.80x = 149,459,990.70 × 72,430,214.60 - Step 4: Simplify right side
99,639,993.80x = 10,825,419,200,515,002 - Step 5: Solve for x
x = 10,825,419,200,515,002/99,639,993.80 - Step 6: Final answer
x = 108,645,321.90
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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.