Finding the Fourth Proportional to 128,757,907.20, 193,136,860.80 and 87,943,238.40
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Solution
The fourth proportional to 128,757,907.20, 193,136,860.80 and 87,943,238.40 is: 131,914,857.60
Step by Step Solution
- Step 1: Write the proportion equation
128,757,907.20 : 193,136,860.80 = 87,943,238.40 : x - Step 2: Convert to fraction form
128,757,907.20/193,136,860.80 = 87,943,238.40/x - Step 3: Cross multiply
128,757,907.20x = 193,136,860.80 × 87,943,238.40 - Step 4: Simplify right side
128,757,907.20x = 16,985,080,993,162,016 - Step 5: Solve for x
x = 16,985,080,993,162,016/128,757,907.20 - Step 6: Final answer
x = 131,914,857.60
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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.