Finding the Fourth Proportional to 129.28, 193.74 and 75.19
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Solution
The fourth proportional to 129.28, 193.74 and 75.19 is: 112.68
Step by Step Solution
- Step 1: Write the proportion equation
129.28 : 193.74 = 75.19 : x - Step 2: Convert to fraction form
129.28/193.74 = 75.19/x - Step 3: Cross multiply
129.28x = 193.74 × 75.19 - Step 4: Simplify right side
129.28x = 14,567.31 - Step 5: Solve for x
x = 14,567.31/129.28 - Step 6: Final answer
x = 112.68
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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.