Finding the Fourth Proportional to 111.81, 154.44 and 78.99
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Solution
The fourth proportional to 111.81, 154.44 and 78.99 is: 109.11
Step by Step Solution
- Step 1: Write the proportion equation
111.81 : 154.44 = 78.99 : x - Step 2: Convert to fraction form
111.81/154.44 = 78.99/x - Step 3: Cross multiply
111.81x = 154.44 × 78.99 - Step 4: Simplify right side
111.81x = 12,199.22 - Step 5: Solve for x
x = 12,199.22/111.81 - Step 6: Final answer
x = 109.11
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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.