Finding the Fourth Proportional to 129.17, 178.19 and 84.99
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Solution
The fourth proportional to 129.17, 178.19 and 84.99 is: 117.24
Step by Step Solution
- Step 1: Write the proportion equation
129.17 : 178.19 = 84.99 : x - Step 2: Convert to fraction form
129.17/178.19 = 84.99/x - Step 3: Cross multiply
129.17x = 178.19 × 84.99 - Step 4: Simplify right side
129.17x = 15,143.48 - Step 5: Solve for x
x = 15,143.48/129.17 - Step 6: Final answer
x = 117.24
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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.