Finding the Fourth Proportional to 129.85, 194.80 and 68.99
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Solution
The fourth proportional to 129.85, 194.80 and 68.99 is: 103.50
Step by Step Solution
- Step 1: Write the proportion equation
129.85 : 194.80 = 68.99 : x - Step 2: Convert to fraction form
129.85/194.80 = 68.99/x - Step 3: Cross multiply
129.85x = 194.80 × 68.99 - Step 4: Simplify right side
129.85x = 13,439.25 - Step 5: Solve for x
x = 13,439.25/129.85 - Step 6: Final answer
x = 103.50
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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.