Finding the Fourth Proportional to 83.40, 115.26 and 79.44
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Solution
The fourth proportional to 83.40, 115.26 and 79.44 is: 109.79
Step by Step Solution
- Step 1: Write the proportion equation
83.40 : 115.26 = 79.44 : x - Step 2: Convert to fraction form
83.40/115.26 = 79.44/x - Step 3: Cross multiply
83.40x = 115.26 × 79.44 - Step 4: Simplify right side
83.40x = 9,156.25 - Step 5: Solve for x
x = 9,156.25/83.40 - Step 6: Final answer
x = 109.79
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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.