Finding the Fourth Proportional to 87.79, 121.16 and 58.66
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Solution
The fourth proportional to 87.79, 121.16 and 58.66 is: 80.96
Step by Step Solution
- Step 1: Write the proportion equation
87.79 : 121.16 = 58.66 : x - Step 2: Convert to fraction form
87.79/121.16 = 58.66/x - Step 3: Cross multiply
87.79x = 121.16 × 58.66 - Step 4: Simplify right side
87.79x = 7,107.25 - Step 5: Solve for x
x = 7,107.25/87.79 - Step 6: Final answer
x = 80.96
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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.