Finding the Fourth Proportional to 100.05, 138.80 and 91.95
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Solution
The fourth proportional to 100.05, 138.80 and 91.95 is: 127.56
Step by Step Solution
- Step 1: Write the proportion equation
100.05 : 138.80 = 91.95 : x - Step 2: Convert to fraction form
100.05/138.80 = 91.95/x - Step 3: Cross multiply
100.05x = 138.80 × 91.95 - Step 4: Simplify right side
100.05x = 12,762.20 - Step 5: Solve for x
x = 12,762.20/100.05 - Step 6: Final answer
x = 127.56
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Why These Related Problems?
These problems maintain the same ratio (1.39) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.