Finding the Fourth Proportional to 139.10, 191.94 and 80.08
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Solution
The fourth proportional to 139.10, 191.94 and 80.08 is: 110.50
Step by Step Solution
- Step 1: Write the proportion equation
139.10 : 191.94 = 80.08 : x - Step 2: Convert to fraction form
139.10/191.94 = 80.08/x - Step 3: Cross multiply
139.10x = 191.94 × 80.08 - Step 4: Simplify right side
139.10x = 15,370.56 - Step 5: Solve for x
x = 15,370.56/139.10 - Step 6: Final answer
x = 110.50
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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.