Finding the Fourth Proportional to 643.20, 964.79 and 277.99
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Solution
The fourth proportional to 643.20, 964.79 and 277.99 is: 416.98
Step by Step Solution
- Step 1: Write the proportion equation
643.20 : 964.79 = 277.99 : x - Step 2: Convert to fraction form
643.20/964.79 = 277.99/x - Step 3: Cross multiply
643.20x = 964.79 × 277.99 - Step 4: Simplify right side
643.20x = 268,201.97 - Step 5: Solve for x
x = 268,201.97/643.20 - Step 6: Final answer
x = 416.98
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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.