Finding the Fourth Proportional to 108.90, 163.44 and 90.99
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Solution
The fourth proportional to 108.90, 163.44 and 90.99 is: 136.56
Step by Step Solution
- Step 1: Write the proportion equation
108.90 : 163.44 = 90.99 : x - Step 2: Convert to fraction form
108.90/163.44 = 90.99/x - Step 3: Cross multiply
108.90x = 163.44 × 90.99 - Step 4: Simplify right side
108.90x = 14,871.41 - Step 5: Solve for x
x = 14,871.41/108.90 - Step 6: Final answer
x = 136.56
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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.