Finding the Fourth Proportional to 128.99, 193.69 and 68.19
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Solution
The fourth proportional to 128.99, 193.69 and 68.19 is: 102.39
Step by Step Solution
- Step 1: Write the proportion equation
128.99 : 193.69 = 68.19 : x - Step 2: Convert to fraction form
128.99/193.69 = 68.19/x - Step 3: Cross multiply
128.99x = 193.69 × 68.19 - Step 4: Simplify right side
128.99x = 13,208.17 - Step 5: Solve for x
x = 13,208.17/128.99 - Step 6: Final answer
x = 102.39
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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.