Finding the Fourth Proportional to 94.21, 129.86 and 79.48
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Solution
The fourth proportional to 94.21, 129.86 and 79.48 is: 109.55
Step by Step Solution
- Step 1: Write the proportion equation
94.21 : 129.86 = 79.48 : x - Step 2: Convert to fraction form
94.21/129.86 = 79.48/x - Step 3: Cross multiply
94.21x = 129.86 × 79.48 - Step 4: Simplify right side
94.21x = 10,320.85 - Step 5: Solve for x
x = 10,320.85/94.21 - Step 6: Final answer
x = 109.55
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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.