Finding the Fourth Proportional to 81.23, 121.90 and 60.99
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Solution
The fourth proportional to 81.23, 121.90 and 60.99 is: 91.53
Step by Step Solution
- Step 1: Write the proportion equation
81.23 : 121.90 = 60.99 : x - Step 2: Convert to fraction form
81.23/121.90 = 60.99/x - Step 3: Cross multiply
81.23x = 121.90 × 60.99 - Step 4: Simplify right side
81.23x = 7,434.99 - Step 5: Solve for x
x = 7,434.99/81.23 - Step 6: Final answer
x = 91.53
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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.