Finding the Fourth Proportional to 81,168.91, 121,785.65 and 31,235.60
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Solution
The fourth proportional to 81,168.91, 121,785.65 and 31,235.60 is: 46,865.82
Step by Step Solution
- Step 1: Write the proportion equation
81,168.91 : 121,785.65 = 31,235.60 : x - Step 2: Convert to fraction form
81,168.91/121,785.65 = 31,235.60/x - Step 3: Cross multiply
81,168.91x = 121,785.65 × 31,235.60 - Step 4: Simplify right side
81,168.91x = 3,804,047,240.21 - Step 5: Solve for x
x = 3,804,047,240.21/81,168.91 - Step 6: Final answer
x = 46,865.82
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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.