Finding the Fourth Proportional to 103.87, 143.12 and 69.31
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Solution
The fourth proportional to 103.87, 143.12 and 69.31 is: 95.50
Step by Step Solution
- Step 1: Write the proportion equation
103.87 : 143.12 = 69.31 : x - Step 2: Convert to fraction form
103.87/143.12 = 69.31/x - Step 3: Cross multiply
103.87x = 143.12 × 69.31 - Step 4: Simplify right side
103.87x = 9,919.30 - Step 5: Solve for x
x = 9,919.30/103.87 - Step 6: Final answer
x = 95.50
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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.