Finding the Fourth Proportional to 98.91, 149.15 and 84.75
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Solution
The fourth proportional to 98.91, 149.15 and 84.75 is: 127.80
Step by Step Solution
- Step 1: Write the proportion equation
98.91 : 149.15 = 84.75 : x - Step 2: Convert to fraction form
98.91/149.15 = 84.75/x - Step 3: Cross multiply
98.91x = 149.15 × 84.75 - Step 4: Simplify right side
98.91x = 12,640.67 - Step 5: Solve for x
x = 12,640.67/98.91 - Step 6: Final answer
x = 127.80
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Why These Related Problems?
These problems maintain the same ratio (1.51) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.