Finding the Fourth Proportional to 121.22, 167.30 and 72.09
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Solution
The fourth proportional to 121.22, 167.30 and 72.09 is: 99.50
Step by Step Solution
- Step 1: Write the proportion equation
121.22 : 167.30 = 72.09 : x - Step 2: Convert to fraction form
121.22/167.30 = 72.09/x - Step 3: Cross multiply
121.22x = 167.30 × 72.09 - Step 4: Simplify right side
121.22x = 12,060.30 - Step 5: Solve for x
x = 12,060.30/121.22 - Step 6: Final answer
x = 99.50
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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.