Finding the Fourth Proportional to 89.85, 134.64 and 78.99
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Solution
The fourth proportional to 89.85, 134.64 and 78.99 is: 118.37
Step by Step Solution
- Step 1: Write the proportion equation
89.85 : 134.64 = 78.99 : x - Step 2: Convert to fraction form
89.85/134.64 = 78.99/x - Step 3: Cross multiply
89.85x = 134.64 × 78.99 - Step 4: Simplify right side
89.85x = 10,635.00 - Step 5: Solve for x
x = 10,635.00/89.85 - Step 6: Final answer
x = 118.37
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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.