Finding the Fourth Proportional to 427.26, 640.88 and 138.68
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Solution
The fourth proportional to 427.26, 640.88 and 138.68 is: 208.02
Step by Step Solution
- Step 1: Write the proportion equation
427.26 : 640.88 = 138.68 : x - Step 2: Convert to fraction form
427.26/640.88 = 138.68/x - Step 3: Cross multiply
427.26x = 640.88 × 138.68 - Step 4: Simplify right side
427.26x = 88,877.24 - Step 5: Solve for x
x = 88,877.24/427.26 - Step 6: Final answer
x = 208.02
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These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.