Finding the Fourth Proportional to 72.40, 108.46 and 68.08
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Solution
The fourth proportional to 72.40, 108.46 and 68.08 is: 101.99
Step by Step Solution
- Step 1: Write the proportion equation
72.40 : 108.46 = 68.08 : x - Step 2: Convert to fraction form
72.40/108.46 = 68.08/x - Step 3: Cross multiply
72.40x = 108.46 × 68.08 - Step 4: Simplify right side
72.40x = 7,383.96 - Step 5: Solve for x
x = 7,383.96/72.40 - Step 6: Final answer
x = 101.99
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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.