Finding the Fourth Proportional to 138.66, 207.99 and 84.88
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Solution
The fourth proportional to 138.66, 207.99 and 84.88 is: 127.32
Step by Step Solution
- Step 1: Write the proportion equation
138.66 : 207.99 = 84.88 : x - Step 2: Convert to fraction form
138.66/207.99 = 84.88/x - Step 3: Cross multiply
138.66x = 207.99 × 84.88 - Step 4: Simplify right side
138.66x = 17,653.77 - Step 5: Solve for x
x = 17,653.77/138.66 - Step 6: Final answer
x = 127.32
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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.