Finding the Fourth Proportional to 154.15, 212.67 and 91.99
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Solution
The fourth proportional to 154.15, 212.67 and 91.99 is: 126.90
Step by Step Solution
- Step 1: Write the proportion equation
154.15 : 212.67 = 91.99 : x - Step 2: Convert to fraction form
154.15/212.67 = 91.99/x - Step 3: Cross multiply
154.15x = 212.67 × 91.99 - Step 4: Simplify right side
154.15x = 19,562.68 - Step 5: Solve for x
x = 19,562.68/154.15 - Step 6: Final answer
x = 126.90
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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.