Finding the Fourth Proportional to 100.71, 138.01 and 90.99
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Solution
The fourth proportional to 100.71, 138.01 and 90.99 is: 124.68
Step by Step Solution
- Step 1: Write the proportion equation
100.71 : 138.01 = 90.99 : x - Step 2: Convert to fraction form
100.71/138.01 = 90.99/x - Step 3: Cross multiply
100.71x = 138.01 × 90.99 - Step 4: Simplify right side
100.71x = 12,556.38 - Step 5: Solve for x
x = 12,556.38/100.71 - Step 6: Final answer
x = 124.68
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Why These Related Problems?
These problems maintain the same ratio (1.37) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.