Finding the Fourth Proportional to 88.41, 121.91 and 79.70
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Solution
The fourth proportional to 88.41, 121.91 and 79.70 is: 109.89
Step by Step Solution
- Step 1: Write the proportion equation
88.41 : 121.91 = 79.70 : x - Step 2: Convert to fraction form
88.41/121.91 = 79.70/x - Step 3: Cross multiply
88.41x = 121.91 × 79.70 - Step 4: Simplify right side
88.41x = 9,715.22 - Step 5: Solve for x
x = 9,715.22/88.41 - Step 6: Final answer
x = 109.89
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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.