Finding the Fourth Proportional to 239.28, 330.21 and 135.78
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Solution
The fourth proportional to 239.28, 330.21 and 135.78 is: 187.38
Step by Step Solution
- Step 1: Write the proportion equation
239.28 : 330.21 = 135.78 : x - Step 2: Convert to fraction form
239.28/330.21 = 135.78/x - Step 3: Cross multiply
239.28x = 330.21 × 135.78 - Step 4: Simplify right side
239.28x = 44,835.91 - Step 5: Solve for x
x = 44,835.91/239.28 - Step 6: Final answer
x = 187.38
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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.