Finding the Fourth Proportional to 86.19, 129.16 and 51.99
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Solution
The fourth proportional to 86.19, 129.16 and 51.99 is: 77.91
Step by Step Solution
- Step 1: Write the proportion equation
86.19 : 129.16 = 51.99 : x - Step 2: Convert to fraction form
86.19/129.16 = 51.99/x - Step 3: Cross multiply
86.19x = 129.16 × 51.99 - Step 4: Simplify right side
86.19x = 6,715.03 - Step 5: Solve for x
x = 6,715.03/86.19 - Step 6: Final answer
x = 77.91
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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.