Finding the Fourth Proportional to 128,908.56, 177,774.84 and 85,912.20
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Solution
The fourth proportional to 128,908.56, 177,774.84 and 85,912.20 is: 118,479.55
Step by Step Solution
- Step 1: Write the proportion equation
128,908.56 : 177,774.84 = 85,912.20 : x - Step 2: Convert to fraction form
128,908.56/177,774.84 = 85,912.20/x - Step 3: Cross multiply
128,908.56x = 177,774.84 × 85,912.20 - Step 4: Simplify right side
128,908.56x = 15,273,027,609.05 - Step 5: Solve for x
x = 15,273,027,609.05/128,908.56 - Step 6: Final answer
x = 118,479.55
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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.