Finding the Fourth Proportional to 290.99, 436.95 and 128.99
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Solution
The fourth proportional to 290.99, 436.95 and 128.99 is: 193.69
Step by Step Solution
- Step 1: Write the proportion equation
290.99 : 436.95 = 128.99 : x - Step 2: Convert to fraction form
290.99/436.95 = 128.99/x - Step 3: Cross multiply
290.99x = 436.95 × 128.99 - Step 4: Simplify right side
290.99x = 56,362.18 - Step 5: Solve for x
x = 56,362.18/290.99 - Step 6: Final answer
x = 193.69
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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.