Finding the Fourth Proportional to 81,215.12, 121,805.94 and 31,278.08
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Solution
The fourth proportional to 81,215.12, 121,805.94 and 31,278.08 is: 46,910.67
Step by Step Solution
- Step 1: Write the proportion equation
81,215.12 : 121,805.94 = 31,278.08 : x - Step 2: Convert to fraction form
81,215.12/121,805.94 = 31,278.08/x - Step 3: Cross multiply
81,215.12x = 121,805.94 × 31,278.08 - Step 4: Simplify right side
81,215.12x = 3,809,855,935.80 - Step 5: Solve for x
x = 3,809,855,935.80/81,215.12 - Step 6: Final answer
x = 46,910.67
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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.