Finding the Fourth Proportional to 129.28, 178.68 and 113.08
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Solution
The fourth proportional to 129.28, 178.68 and 113.08 is: 156.29
Step by Step Solution
- Step 1: Write the proportion equation
129.28 : 178.68 = 113.08 : x - Step 2: Convert to fraction form
129.28/178.68 = 113.08/x - Step 3: Cross multiply
129.28x = 178.68 × 113.08 - Step 4: Simplify right side
129.28x = 20,205.13 - Step 5: Solve for x
x = 20,205.13/129.28 - Step 6: Final answer
x = 156.29
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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.