Finding the Fourth Proportional to 86.79, 119.74 and 53.99
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Solution
The fourth proportional to 86.79, 119.74 and 53.99 is: 74.48
Step by Step Solution
- Step 1: Write the proportion equation
86.79 : 119.74 = 53.99 : x - Step 2: Convert to fraction form
86.79/119.74 = 53.99/x - Step 3: Cross multiply
86.79x = 119.74 × 53.99 - Step 4: Simplify right side
86.79x = 6,464.48 - Step 5: Solve for x
x = 6,464.48/86.79 - Step 6: Final answer
x = 74.48
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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.