Finding the Fourth Proportional to 87,990.11, 121,394.53 and 57,791.80
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Solution
The fourth proportional to 87,990.11, 121,394.53 and 57,791.80 is: 79,731.78
Step by Step Solution
- Step 1: Write the proportion equation
87,990.11 : 121,394.53 = 57,791.80 : x - Step 2: Convert to fraction form
87,990.11/121,394.53 = 57,791.80/x - Step 3: Cross multiply
87,990.11x = 121,394.53 × 57,791.80 - Step 4: Simplify right side
87,990.11x = 7,015,608,398.85 - Step 5: Solve for x
x = 7,015,608,398.85/87,990.11 - Step 6: Final answer
x = 79,731.78
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Why These Related Problems?
These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.