Finding the Fourth Proportional to 98.70, 136.08 and 84.12
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Solution
The fourth proportional to 98.70, 136.08 and 84.12 is: 115.98
Step by Step Solution
- Step 1: Write the proportion equation
98.70 : 136.08 = 84.12 : x - Step 2: Convert to fraction form
98.70/136.08 = 84.12/x - Step 3: Cross multiply
98.70x = 136.08 × 84.12 - Step 4: Simplify right side
98.70x = 11,447.05 - Step 5: Solve for x
x = 11,447.05/98.70 - Step 6: Final answer
x = 115.98
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These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.