Finding the Fourth Proportional to 129.60, 178.68 and 92.70
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Solution
The fourth proportional to 129.60, 178.68 and 92.70 is: 127.81
Step by Step Solution
- Step 1: Write the proportion equation
129.60 : 178.68 = 92.70 : x - Step 2: Convert to fraction form
129.60/178.68 = 92.70/x - Step 3: Cross multiply
129.60x = 178.68 × 92.70 - Step 4: Simplify right side
129.60x = 16,563.64 - Step 5: Solve for x
x = 16,563.64/129.60 - Step 6: Final answer
x = 127.81
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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.