Finding the Fourth Proportional to 129.16, 177.90 and 122.99
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Solution
The fourth proportional to 129.16, 177.90 and 122.99 is: 169.39
Step by Step Solution
- Step 1: Write the proportion equation
129.16 : 177.90 = 122.99 : x - Step 2: Convert to fraction form
129.16/177.90 = 122.99/x - Step 3: Cross multiply
129.16x = 177.90 × 122.99 - Step 4: Simplify right side
129.16x = 21,878.57 - Step 5: Solve for x
x = 21,878.57/129.16 - Step 6: Final answer
x = 169.39
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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.