Finding the Fourth Proportional to 120.99, 181.65 and 86.97
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Solution
The fourth proportional to 120.99, 181.65 and 86.97 is: 130.57
Step by Step Solution
- Step 1: Write the proportion equation
120.99 : 181.65 = 86.97 : x - Step 2: Convert to fraction form
120.99/181.65 = 86.97/x - Step 3: Cross multiply
120.99x = 181.65 × 86.97 - Step 4: Simplify right side
120.99x = 15,798.10 - Step 5: Solve for x
x = 15,798.10/120.99 - Step 6: Final answer
x = 130.57
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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.