Finding the Fourth Proportional to 78,121.62, 117,187.91 and 31,374.50
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Solution
The fourth proportional to 78,121.62, 117,187.91 and 31,374.50 is: 47,063.95
Step by Step Solution
- Step 1: Write the proportion equation
78,121.62 : 117,187.91 = 31,374.50 : x - Step 2: Convert to fraction form
78,121.62/117,187.91 = 31,374.50/x - Step 3: Cross multiply
78,121.62x = 117,187.91 × 31,374.50 - Step 4: Simplify right side
78,121.62x = 3,676,712,082.30 - Step 5: Solve for x
x = 3,676,712,082.30/78,121.62 - Step 6: Final answer
x = 47,063.95
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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.