Finding the Fourth Proportional to 128.24, 176.99 and 72.99
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Solution
The fourth proportional to 128.24, 176.99 and 72.99 is: 100.74
Step by Step Solution
- Step 1: Write the proportion equation
128.24 : 176.99 = 72.99 : x - Step 2: Convert to fraction form
128.24/176.99 = 72.99/x - Step 3: Cross multiply
128.24x = 176.99 × 72.99 - Step 4: Simplify right side
128.24x = 12,918.50 - Step 5: Solve for x
x = 12,918.50/128.24 - Step 6: Final answer
x = 100.74
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Why These Related Problems?
These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.