Finding the Fourth Proportional to 81,138.36, 121,508.82 and 67,011.96
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Solution
The fourth proportional to 81,138.36, 121,508.82 and 67,011.96 is: 100,353.82
Step by Step Solution
- Step 1: Write the proportion equation
81,138.36 : 121,508.82 = 67,011.96 : x - Step 2: Convert to fraction form
81,138.36/121,508.82 = 67,011.96/x - Step 3: Cross multiply
81,138.36x = 121,508.82 × 67,011.96 - Step 4: Simplify right side
81,138.36x = 8,142,544,185.49 - Step 5: Solve for x
x = 8,142,544,185.49/81,138.36 - Step 6: Final answer
x = 100,353.82
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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.