Finding the Fourth Proportional to 86.22, 129.22 and 66.99
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Solution
The fourth proportional to 86.22, 129.22 and 66.99 is: 100.39
Step by Step Solution
- Step 1: Write the proportion equation
86.22 : 129.22 = 66.99 : x - Step 2: Convert to fraction form
86.22/129.22 = 66.99/x - Step 3: Cross multiply
86.22x = 129.22 × 66.99 - Step 4: Simplify right side
86.22x = 8,655.80 - Step 5: Solve for x
x = 8,655.80/86.22 - Step 6: Final answer
x = 100.39
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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.