Finding the Fourth Proportional to 129.19, 178.21 and 98.12
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Solution
The fourth proportional to 129.19, 178.21 and 98.12 is: 135.35
Step by Step Solution
- Step 1: Write the proportion equation
129.19 : 178.21 = 98.12 : x - Step 2: Convert to fraction form
129.19/178.21 = 98.12/x - Step 3: Cross multiply
129.19x = 178.21 × 98.12 - Step 4: Simplify right side
129.19x = 17,485.97 - Step 5: Solve for x
x = 17,485.97/129.19 - Step 6: Final answer
x = 135.35
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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.