Finding the Fourth Proportional to 129,502.44, 178,721.58 and 78,520.05
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Solution
The fourth proportional to 129,502.44, 178,721.58 and 78,520.05 is: 108,362.65
Step by Step Solution
- Step 1: Write the proportion equation
129,502.44 : 178,721.58 = 78,520.05 : x - Step 2: Convert to fraction form
129,502.44/178,721.58 = 78,520.05/x - Step 3: Cross multiply
129,502.44x = 178,721.58 × 78,520.05 - Step 4: Simplify right side
129,502.44x = 14,033,227,397.68 - Step 5: Solve for x
x = 14,033,227,397.68/129,502.44 - Step 6: Final answer
x = 108,362.65
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Why These Related Problems?
These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.