Finding the Fourth Proportional to 121.99, 168.43 and 79.99
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Solution
The fourth proportional to 121.99, 168.43 and 79.99 is: 110.44
Step by Step Solution
- Step 1: Write the proportion equation
121.99 : 168.43 = 79.99 : x - Step 2: Convert to fraction form
121.99/168.43 = 79.99/x - Step 3: Cross multiply
121.99x = 168.43 × 79.99 - Step 4: Simplify right side
121.99x = 13,472.72 - Step 5: Solve for x
x = 13,472.72/121.99 - Step 6: Final answer
x = 110.44
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These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.