Finding the Fourth Proportional to 100.63, 138.88 and 73.12
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Solution
The fourth proportional to 100.63, 138.88 and 73.12 is: 100.92
Step by Step Solution
- Step 1: Write the proportion equation
100.63 : 138.88 = 73.12 : x - Step 2: Convert to fraction form
100.63/138.88 = 73.12/x - Step 3: Cross multiply
100.63x = 138.88 × 73.12 - Step 4: Simplify right side
100.63x = 10,155.17 - Step 5: Solve for x
x = 10,155.17/100.63 - Step 6: Final answer
x = 100.92
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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.