Finding the Fourth Proportional to 129.84, 178.92 and 121.08
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Solution
The fourth proportional to 129.84, 178.92 and 121.08 is: 166.85
Step by Step Solution
- Step 1: Write the proportion equation
129.84 : 178.92 = 121.08 : x - Step 2: Convert to fraction form
129.84/178.92 = 121.08/x - Step 3: Cross multiply
129.84x = 178.92 × 121.08 - Step 4: Simplify right side
129.84x = 21,663.63 - Step 5: Solve for x
x = 21,663.63/129.84 - Step 6: Final answer
x = 166.85
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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.