Finding the Fourth Proportional to 76.96, 106.26 and 63.12
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Solution
The fourth proportional to 76.96, 106.26 and 63.12 is: 87.15
Step by Step Solution
- Step 1: Write the proportion equation
76.96 : 106.26 = 63.12 : x - Step 2: Convert to fraction form
76.96/106.26 = 63.12/x - Step 3: Cross multiply
76.96x = 106.26 × 63.12 - Step 4: Simplify right side
76.96x = 6,707.13 - Step 5: Solve for x
x = 6,707.13/76.96 - Step 6: Final answer
x = 87.15
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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.