Finding the Fourth Proportional to 155.40, 213.99 and 129.09
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Solution
The fourth proportional to 155.40, 213.99 and 129.09 is: 177.76
Step by Step Solution
- Step 1: Write the proportion equation
155.40 : 213.99 = 129.09 : x - Step 2: Convert to fraction form
155.40/213.99 = 129.09/x - Step 3: Cross multiply
155.40x = 213.99 × 129.09 - Step 4: Simplify right side
155.40x = 27,623.97 - Step 5: Solve for x
x = 27,623.97/155.40 - Step 6: Final answer
x = 177.76
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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.