Finding the Fourth Proportional to 129.74, 178.98 and 119.93
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Solution
The fourth proportional to 129.74, 178.98 and 119.93 is: 165.45
Step by Step Solution
- Step 1: Write the proportion equation
129.74 : 178.98 = 119.93 : x - Step 2: Convert to fraction form
129.74/178.98 = 119.93/x - Step 3: Cross multiply
129.74x = 178.98 × 119.93 - Step 4: Simplify right side
129.74x = 21,464.18 - Step 5: Solve for x
x = 21,464.18/129.74 - Step 6: Final answer
x = 165.45
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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.