Finding the Fourth Proportional to 131.74, 181.83 and 87.49
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Solution
The fourth proportional to 131.74, 181.83 and 87.49 is: 120.75
Step by Step Solution
- Step 1: Write the proportion equation
131.74 : 181.83 = 87.49 : x - Step 2: Convert to fraction form
131.74/181.83 = 87.49/x - Step 3: Cross multiply
131.74x = 181.83 × 87.49 - Step 4: Simplify right side
131.74x = 15,908.20 - Step 5: Solve for x
x = 15,908.20/131.74 - Step 6: Final answer
x = 120.75
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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.