Finding the Fourth Proportional to 128,912.60, 193,171.11 and 53,991.75
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Solution
The fourth proportional to 128,912.60, 193,171.11 and 53,991.75 is: 80,904.79
Step by Step Solution
- Step 1: Write the proportion equation
128,912.60 : 193,171.11 = 53,991.75 : x - Step 2: Convert to fraction form
128,912.60/193,171.11 = 53,991.75/x - Step 3: Cross multiply
128,912.60x = 193,171.11 × 53,991.75 - Step 4: Simplify right side
128,912.60x = 10,429,646,278.34 - Step 5: Solve for x
x = 10,429,646,278.34/128,912.60 - Step 6: Final answer
x = 80,904.79
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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.