Finding the Fourth Proportional to 128.99, 192.24 and 128.79
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Solution
The fourth proportional to 128.99, 192.24 and 128.79 is: 191.95
Step by Step Solution
- Step 1: Write the proportion equation
128.99 : 192.24 = 128.79 : x - Step 2: Convert to fraction form
128.99/192.24 = 128.79/x - Step 3: Cross multiply
128.99x = 192.24 × 128.79 - Step 4: Simplify right side
128.99x = 24,758.59 - Step 5: Solve for x
x = 24,758.59/128.99 - Step 6: Final answer
x = 191.95
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Why These Related Problems?
These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.