Finding the Fourth Proportional to 108.43, 149.71 and 78.96
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Solution
The fourth proportional to 108.43, 149.71 and 78.96 is: 109.02
Step by Step Solution
- Step 1: Write the proportion equation
108.43 : 149.71 = 78.96 : x - Step 2: Convert to fraction form
108.43/149.71 = 78.96/x - Step 3: Cross multiply
108.43x = 149.71 × 78.96 - Step 4: Simplify right side
108.43x = 11,821.10 - Step 5: Solve for x
x = 11,821.10/108.43 - Step 6: Final answer
x = 109.02
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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.