Finding the Fourth Proportional to 86.24, 129.38 and 65.99
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Solution
The fourth proportional to 86.24, 129.38 and 65.99 is: 98.99
Step by Step Solution
- Step 1: Write the proportion equation
86.24 : 129.38 = 65.99 : x - Step 2: Convert to fraction form
86.24/129.38 = 65.99/x - Step 3: Cross multiply
86.24x = 129.38 × 65.99 - Step 4: Simplify right side
86.24x = 8,536.81 - Step 5: Solve for x
x = 8,536.81/86.24 - Step 6: Final answer
x = 98.99
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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.