Finding the Fourth Proportional to 81,286.80, 121,930.20 and 61,603.80
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Solution
The fourth proportional to 81,286.80, 121,930.20 and 61,603.80 is: 92,405.70
Step by Step Solution
- Step 1: Write the proportion equation
81,286.80 : 121,930.20 = 61,603.80 : x - Step 2: Convert to fraction form
81,286.80/121,930.20 = 61,603.80/x - Step 3: Cross multiply
81,286.80x = 121,930.20 × 61,603.80 - Step 4: Simplify right side
81,286.80x = 7,511,363,654.76 - Step 5: Solve for x
x = 7,511,363,654.76/81,286.80 - Step 6: Final answer
x = 92,405.70
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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.