Finding the Fourth Proportional to 77,278.20, 115,917.30 and 53,431.80
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Solution
The fourth proportional to 77,278.20, 115,917.30 and 53,431.80 is: 80,147.70
Step by Step Solution
- Step 1: Write the proportion equation
77,278.20 : 115,917.30 = 53,431.80 : x - Step 2: Convert to fraction form
77,278.20/115,917.30 = 53,431.80/x - Step 3: Cross multiply
77,278.20x = 115,917.30 × 53,431.80 - Step 4: Simplify right side
77,278.20x = 6,193,669,990.14 - Step 5: Solve for x
x = 6,193,669,990.14/77,278.20 - Step 6: Final answer
x = 80,147.70
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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.