Finding the Fourth Proportional to 81.08, 121.54 and 73.08
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Solution
The fourth proportional to 81.08, 121.54 and 73.08 is: 109.55
Step by Step Solution
- Step 1: Write the proportion equation
81.08 : 121.54 = 73.08 : x - Step 2: Convert to fraction form
81.08/121.54 = 73.08/x - Step 3: Cross multiply
81.08x = 121.54 × 73.08 - Step 4: Simplify right side
81.08x = 8,882.14 - Step 5: Solve for x
x = 8,882.14/81.08 - Step 6: Final answer
x = 109.55
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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.