Finding the Fourth Proportional to 86.19, 118.59 and 83.91
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Solution
The fourth proportional to 86.19, 118.59 and 83.91 is: 115.45
Step by Step Solution
- Step 1: Write the proportion equation
86.19 : 118.59 = 83.91 : x - Step 2: Convert to fraction form
86.19/118.59 = 83.91/x - Step 3: Cross multiply
86.19x = 118.59 × 83.91 - Step 4: Simplify right side
86.19x = 9,950.89 - Step 5: Solve for x
x = 9,950.89/86.19 - Step 6: Final answer
x = 115.45
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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.