Finding the Fourth Proportional to 121.53, 167.62 and 86.68
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Solution
The fourth proportional to 121.53, 167.62 and 86.68 is: 119.55
Step by Step Solution
- Step 1: Write the proportion equation
121.53 : 167.62 = 86.68 : x - Step 2: Convert to fraction form
121.53/167.62 = 86.68/x - Step 3: Cross multiply
121.53x = 167.62 × 86.68 - Step 4: Simplify right side
121.53x = 14,528.99 - Step 5: Solve for x
x = 14,528.99/121.53 - Step 6: Final answer
x = 119.55
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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.