Finding the Fourth Proportional to 91.99, 137.99 and 31.13
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Solution
The fourth proportional to 91.99, 137.99 and 31.13 is: 46.70
Step by Step Solution
- Step 1: Write the proportion equation
91.99 : 137.99 = 31.13 : x - Step 2: Convert to fraction form
91.99/137.99 = 31.13/x - Step 3: Cross multiply
91.99x = 137.99 × 31.13 - Step 4: Simplify right side
91.99x = 4,295.63 - Step 5: Solve for x
x = 4,295.63/91.99 - Step 6: Final answer
x = 46.70
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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.