Finding the Fourth Proportional to 10.91, 16.40 and 7.31
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Solution
The fourth proportional to 10.91, 16.40 and 7.31 is: 10.99
Step by Step Solution
- Step 1: Write the proportion equation
10.91 : 16.40 = 7.31 : x - Step 2: Convert to fraction form
10.91/16.40 = 7.31/x - Step 3: Cross multiply
10.91x = 16.40 × 7.31 - Step 4: Simplify right side
10.91x = 119.94 - Step 5: Solve for x
x = 119.94/10.91 - Step 6: Final answer
x = 10.99
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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.