Finding the Fourth Proportional to 258.49, 387.99 and 121.63
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Solution
The fourth proportional to 258.49, 387.99 and 121.63 is: 182.57
Step by Step Solution
- Step 1: Write the proportion equation
258.49 : 387.99 = 121.63 : x - Step 2: Convert to fraction form
258.49/387.99 = 121.63/x - Step 3: Cross multiply
258.49x = 387.99 × 121.63 - Step 4: Simplify right side
258.49x = 47,191.22 - Step 5: Solve for x
x = 47,191.22/258.49 - Step 6: Final answer
x = 182.57
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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.