Finding the Fourth Proportional to 128.99, 193.44 and 47.79
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Solution
The fourth proportional to 128.99, 193.44 and 47.79 is: 71.67
Step by Step Solution
- Step 1: Write the proportion equation
128.99 : 193.44 = 47.79 : x - Step 2: Convert to fraction form
128.99/193.44 = 47.79/x - Step 3: Cross multiply
128.99x = 193.44 × 47.79 - Step 4: Simplify right side
128.99x = 9,244.41 - Step 5: Solve for x
x = 9,244.41/128.99 - Step 6: Final answer
x = 71.67
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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.