Finding the Fourth Proportional to 285.19, 427.74 and 79.78
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Solution
The fourth proportional to 285.19, 427.74 and 79.78 is: 119.66
Step by Step Solution
- Step 1: Write the proportion equation
285.19 : 427.74 = 79.78 : x - Step 2: Convert to fraction form
285.19/427.74 = 79.78/x - Step 3: Cross multiply
285.19x = 427.74 × 79.78 - Step 4: Simplify right side
285.19x = 34,125.10 - Step 5: Solve for x
x = 34,125.10/285.19 - Step 6: Final answer
x = 119.66
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Why These Related Problems?
These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.