Finding the Fourth Proportional to 135.61, 203.21 and 128.68
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Solution
The fourth proportional to 135.61, 203.21 and 128.68 is: 192.83
Step by Step Solution
- Step 1: Write the proportion equation
135.61 : 203.21 = 128.68 : x - Step 2: Convert to fraction form
135.61/203.21 = 128.68/x - Step 3: Cross multiply
135.61x = 203.21 × 128.68 - Step 4: Simplify right side
135.61x = 26,149.06 - Step 5: Solve for x
x = 26,149.06/135.61 - Step 6: Final answer
x = 192.83
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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.