Finding the Fourth Proportional to 91.02, 125.79 and 87.99
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Solution
The fourth proportional to 91.02, 125.79 and 87.99 is: 121.60
Step by Step Solution
- Step 1: Write the proportion equation
91.02 : 125.79 = 87.99 : x - Step 2: Convert to fraction form
91.02/125.79 = 87.99/x - Step 3: Cross multiply
91.02x = 125.79 × 87.99 - Step 4: Simplify right side
91.02x = 11,068.26 - Step 5: Solve for x
x = 11,068.26/91.02 - Step 6: Final answer
x = 121.60
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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.