Finding the Fourth Proportional to 121.10, 167.14 and 79.66
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Solution
The fourth proportional to 121.10, 167.14 and 79.66 is: 109.94
Step by Step Solution
- Step 1: Write the proportion equation
121.10 : 167.14 = 79.66 : x - Step 2: Convert to fraction form
121.10/167.14 = 79.66/x - Step 3: Cross multiply
121.10x = 167.14 × 79.66 - Step 4: Simplify right side
121.10x = 13,313.76 - Step 5: Solve for x
x = 13,313.76/121.10 - Step 6: Final answer
x = 109.94
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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.