Finding the Fourth Proportional to 120.90, 181.07 and 84.99
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Solution
The fourth proportional to 120.90, 181.07 and 84.99 is: 127.29
Step by Step Solution
- Step 1: Write the proportion equation
120.90 : 181.07 = 84.99 : x - Step 2: Convert to fraction form
120.90/181.07 = 84.99/x - Step 3: Cross multiply
120.90x = 181.07 × 84.99 - Step 4: Simplify right side
120.90x = 15,389.14 - Step 5: Solve for x
x = 15,389.14/120.90 - Step 6: Final answer
x = 127.29
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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.