Finding the Fourth Proportional to 386.75, 534.20 and 288.95
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Solution
The fourth proportional to 386.75, 534.20 and 288.95 is: 399.10
Step by Step Solution
- Step 1: Write the proportion equation
386.75 : 534.20 = 288.95 : x - Step 2: Convert to fraction form
386.75/534.20 = 288.95/x - Step 3: Cross multiply
386.75x = 534.20 × 288.95 - Step 4: Simplify right side
386.75x = 154,352.97 - Step 5: Solve for x
x = 154,352.97/386.75 - Step 6: Final answer
x = 399.10
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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.