Finding the Fourth Proportional to 129.21, 193.65 and 74.99
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Solution
The fourth proportional to 129.21, 193.65 and 74.99 is: 112.39
Step by Step Solution
- Step 1: Write the proportion equation
129.21 : 193.65 = 74.99 : x - Step 2: Convert to fraction form
129.21/193.65 = 74.99/x - Step 3: Cross multiply
129.21x = 193.65 × 74.99 - Step 4: Simplify right side
129.21x = 14,521.81 - Step 5: Solve for x
x = 14,521.81/129.21 - Step 6: Final answer
x = 112.39
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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.