Finding the Fourth Proportional to 98.36, 135.84 and 63.40
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Solution
The fourth proportional to 98.36, 135.84 and 63.40 is: 87.56
Step by Step Solution
- Step 1: Write the proportion equation
98.36 : 135.84 = 63.40 : x - Step 2: Convert to fraction form
98.36/135.84 = 63.40/x - Step 3: Cross multiply
98.36x = 135.84 × 63.40 - Step 4: Simplify right side
98.36x = 8,612.26 - Step 5: Solve for x
x = 8,612.26/98.36 - Step 6: Final answer
x = 87.56
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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.