Finding the Fourth Proportional to 91.36, 125.84 and 79.68
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Solution
The fourth proportional to 91.36, 125.84 and 79.68 is: 109.75
Step by Step Solution
- Step 1: Write the proportion equation
91.36 : 125.84 = 79.68 : x - Step 2: Convert to fraction form
91.36/125.84 = 79.68/x - Step 3: Cross multiply
91.36x = 125.84 × 79.68 - Step 4: Simplify right side
91.36x = 10,026.93 - Step 5: Solve for x
x = 10,026.93/91.36 - Step 6: Final answer
x = 109.75
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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.