Finding the Fourth Proportional to 91.39, 126.09 and 74.99
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Solution
The fourth proportional to 91.39, 126.09 and 74.99 is: 103.46
Step by Step Solution
- Step 1: Write the proportion equation
91.39 : 126.09 = 74.99 : x - Step 2: Convert to fraction form
91.39/126.09 = 74.99/x - Step 3: Cross multiply
91.39x = 126.09 × 74.99 - Step 4: Simplify right side
91.39x = 9,455.49 - Step 5: Solve for x
x = 9,455.49/91.39 - Step 6: Final answer
x = 103.46
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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.