Finding the Fourth Proportional to 98.76, 135.84 and 87.48
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Solution
The fourth proportional to 98.76, 135.84 and 87.48 is: 120.32
Step by Step Solution
- Step 1: Write the proportion equation
98.76 : 135.84 = 87.48 : x - Step 2: Convert to fraction form
98.76/135.84 = 87.48/x - Step 3: Cross multiply
98.76x = 135.84 × 87.48 - Step 4: Simplify right side
98.76x = 11,883.28 - Step 5: Solve for x
x = 11,883.28/98.76 - Step 6: Final answer
x = 120.32
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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.