Finding the Fourth Proportional to 90.99, 125.79 and 87.17
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Solution
The fourth proportional to 90.99, 125.79 and 87.17 is: 120.50
Step by Step Solution
- Step 1: Write the proportion equation
90.99 : 125.79 = 87.17 : x - Step 2: Convert to fraction form
90.99/125.79 = 87.17/x - Step 3: Cross multiply
90.99x = 125.79 × 87.17 - Step 4: Simplify right side
90.99x = 10,964.16 - Step 5: Solve for x
x = 10,964.16/90.99 - Step 6: Final answer
x = 120.50
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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.