Finding the Fourth Proportional to 121.23, 167.31 and 72.09
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Solution
The fourth proportional to 121.23, 167.31 and 72.09 is: 99.49
Step by Step Solution
- Step 1: Write the proportion equation
121.23 : 167.31 = 72.09 : x - Step 2: Convert to fraction form
121.23/167.31 = 72.09/x - Step 3: Cross multiply
121.23x = 167.31 × 72.09 - Step 4: Simplify right side
121.23x = 12,061.38 - Step 5: Solve for x
x = 12,061.38/121.23 - Step 6: Final answer
x = 99.49
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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.