Finding the Fourth Proportional to 129.08, 178.01 and 91.66
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Solution
The fourth proportional to 129.08, 178.01 and 91.66 is: 126.41
Step by Step Solution
- Step 1: Write the proportion equation
129.08 : 178.01 = 91.66 : x - Step 2: Convert to fraction form
129.08/178.01 = 91.66/x - Step 3: Cross multiply
129.08x = 178.01 × 91.66 - Step 4: Simplify right side
129.08x = 16,316.96 - Step 5: Solve for x
x = 16,316.96/129.08 - Step 6: Final answer
x = 126.41
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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.