Finding the Fourth Proportional to 193.99, 290.99 and 85.78
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Solution
The fourth proportional to 193.99, 290.99 and 85.78 is: 128.67
Step by Step Solution
- Step 1: Write the proportion equation
193.99 : 290.99 = 85.78 : x - Step 2: Convert to fraction form
193.99/290.99 = 85.78/x - Step 3: Cross multiply
193.99x = 290.99 × 85.78 - Step 4: Simplify right side
193.99x = 24,961.12 - Step 5: Solve for x
x = 24,961.12/193.99 - Step 6: Final answer
x = 128.67
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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.