Finding the Fourth Proportional to 20,775,662.20, 31,163,493.30 and 13,122,911.80
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Solution
The fourth proportional to 20,775,662.20, 31,163,493.30 and 13,122,911.80 is: 19,684,367.70
Step by Step Solution
- Step 1: Write the proportion equation
20,775,662.20 : 31,163,493.30 = 13,122,911.80 : x - Step 2: Convert to fraction form
20,775,662.20/31,163,493.30 = 13,122,911.80/x - Step 3: Cross multiply
20,775,662.20x = 31,163,493.30 × 13,122,911.80 - Step 4: Simplify right side
20,775,662.20x = 408,955,773,955,791 - Step 5: Solve for x
x = 408,955,773,955,791/20,775,662.20 - Step 6: Final answer
x = 19,684,367.70
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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.