Finding the Fourth Proportional to 91.37, 136.28 and 77.02
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Solution
The fourth proportional to 91.37, 136.28 and 77.02 is: 114.88
Step by Step Solution
- Step 1: Write the proportion equation
91.37 : 136.28 = 77.02 : x - Step 2: Convert to fraction form
91.37/136.28 = 77.02/x - Step 3: Cross multiply
91.37x = 136.28 × 77.02 - Step 4: Simplify right side
91.37x = 10,496.29 - Step 5: Solve for x
x = 10,496.29/91.37 - Step 6: Final answer
x = 114.88
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Why These Related Problems?
These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.