Finding the Fourth Proportional to 98.68, 147.67 and 85.99
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Solution
The fourth proportional to 98.68, 147.67 and 85.99 is: 128.68
Step by Step Solution
- Step 1: Write the proportion equation
98.68 : 147.67 = 85.99 : x - Step 2: Convert to fraction form
98.68/147.67 = 85.99/x - Step 3: Cross multiply
98.68x = 147.67 × 85.99 - Step 4: Simplify right side
98.68x = 12,698.14 - Step 5: Solve for x
x = 12,698.14/98.68 - Step 6: Final answer
x = 128.68
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Why These Related Problems?
These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.