Finding the Fourth Proportional to 136.97, 188.99 and 87.21
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Solution
The fourth proportional to 136.97, 188.99 and 87.21 is: 120.32
Step by Step Solution
- Step 1: Write the proportion equation
136.97 : 188.99 = 87.21 : x - Step 2: Convert to fraction form
136.97/188.99 = 87.21/x - Step 3: Cross multiply
136.97x = 188.99 × 87.21 - Step 4: Simplify right side
136.97x = 16,480.44 - Step 5: Solve for x
x = 16,480.44/136.97 - Step 6: Final answer
x = 120.32
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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.