Finding the Fourth Proportional to 396.40, 547.02 and 221.74
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Solution
The fourth proportional to 396.40, 547.02 and 221.74 is: 305.99
Step by Step Solution
- Step 1: Write the proportion equation
396.40 : 547.02 = 221.74 : x - Step 2: Convert to fraction form
396.40/547.02 = 221.74/x - Step 3: Cross multiply
396.40x = 547.02 × 221.74 - Step 4: Simplify right side
396.40x = 121,296.21 - Step 5: Solve for x
x = 121,296.21/396.40 - Step 6: Final answer
x = 305.99
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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.