Finding the Fourth Proportional to 89.87, 135.61 and 86.81
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Solution
The fourth proportional to 89.87, 135.61 and 86.81 is: 130.99
Step by Step Solution
- Step 1: Write the proportion equation
89.87 : 135.61 = 86.81 : x - Step 2: Convert to fraction form
89.87/135.61 = 86.81/x - Step 3: Cross multiply
89.87x = 135.61 × 86.81 - Step 4: Simplify right side
89.87x = 11,771.41 - Step 5: Solve for x
x = 11,771.41/89.87 - Step 6: Final answer
x = 130.99
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Why These Related Problems?
These problems maintain the same ratio (1.51) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.