Finding the Fourth Proportional to 74.78, 112.06 and 38.70
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Solution
The fourth proportional to 74.78, 112.06 and 38.70 is: 57.99
Step by Step Solution
- Step 1: Write the proportion equation
74.78 : 112.06 = 38.70 : x - Step 2: Convert to fraction form
74.78/112.06 = 38.70/x - Step 3: Cross multiply
74.78x = 112.06 × 38.70 - Step 4: Simplify right side
74.78x = 4,336.72 - Step 5: Solve for x
x = 4,336.72/74.78 - Step 6: Final answer
x = 57.99
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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.