Finding the Fourth Proportional to 84.19, 115.87 and 74.98
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Solution
The fourth proportional to 84.19, 115.87 and 74.98 is: 103.19
Step by Step Solution
- Step 1: Write the proportion equation
84.19 : 115.87 = 74.98 : x - Step 2: Convert to fraction form
84.19/115.87 = 74.98/x - Step 3: Cross multiply
84.19x = 115.87 × 74.98 - Step 4: Simplify right side
84.19x = 8,687.93 - Step 5: Solve for x
x = 8,687.93/84.19 - Step 6: Final answer
x = 103.19
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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.