Finding the Fourth Proportional to 207.21, 285.99 and 129.55
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Solution
The fourth proportional to 207.21, 285.99 and 129.55 is: 178.80
Step by Step Solution
- Step 1: Write the proportion equation
207.21 : 285.99 = 129.55 : x - Step 2: Convert to fraction form
207.21/285.99 = 129.55/x - Step 3: Cross multiply
207.21x = 285.99 × 129.55 - Step 4: Simplify right side
207.21x = 37,049.36 - Step 5: Solve for x
x = 37,049.36/207.21 - Step 6: Final answer
x = 178.80
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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.