Finding the Fourth Proportional to 207.21, 310.92 and 91.77
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Solution
The fourth proportional to 207.21, 310.92 and 91.77 is: 137.70
Step by Step Solution
- Step 1: Write the proportion equation
207.21 : 310.92 = 91.77 : x - Step 2: Convert to fraction form
207.21/310.92 = 91.77/x - Step 3: Cross multiply
207.21x = 310.92 × 91.77 - Step 4: Simplify right side
207.21x = 28,532.13 - Step 5: Solve for x
x = 28,532.13/207.21 - Step 6: Final answer
x = 137.70
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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.