Finding the Fourth Proportional to 112.41, 154.89 and 87.81
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Solution
The fourth proportional to 112.41, 154.89 and 87.81 is: 120.99
Step by Step Solution
- Step 1: Write the proportion equation
112.41 : 154.89 = 87.81 : x - Step 2: Convert to fraction form
112.41/154.89 = 87.81/x - Step 3: Cross multiply
112.41x = 154.89 × 87.81 - Step 4: Simplify right side
112.41x = 13,600.89 - Step 5: Solve for x
x = 13,600.89/112.41 - Step 6: Final answer
x = 120.99
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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.