Finding the Fourth Proportional to 387.19, 580.79 and 130.87
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Solution
The fourth proportional to 387.19, 580.79 and 130.87 is: 196.31
Step by Step Solution
- Step 1: Write the proportion equation
387.19 : 580.79 = 130.87 : x - Step 2: Convert to fraction form
387.19/580.79 = 130.87/x - Step 3: Cross multiply
387.19x = 580.79 × 130.87 - Step 4: Simplify right side
387.19x = 76,007.99 - Step 5: Solve for x
x = 76,007.99/387.19 - Step 6: Final answer
x = 196.31
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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.