Finding the Fourth Proportional to 135.36, 202.88 and 81.22
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Solution
The fourth proportional to 135.36, 202.88 and 81.22 is: 121.73
Step by Step Solution
- Step 1: Write the proportion equation
135.36 : 202.88 = 81.22 : x - Step 2: Convert to fraction form
135.36/202.88 = 81.22/x - Step 3: Cross multiply
135.36x = 202.88 × 81.22 - Step 4: Simplify right side
135.36x = 16,477.91 - Step 5: Solve for x
x = 16,477.91/135.36 - Step 6: Final answer
x = 121.73
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Why These Related Problems?
These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.