Finding the Fourth Proportional to 138.51, 207.78 and 69.99
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Solution
The fourth proportional to 138.51, 207.78 and 69.99 is: 104.99
Step by Step Solution
- Step 1: Write the proportion equation
138.51 : 207.78 = 69.99 : x - Step 2: Convert to fraction form
138.51/207.78 = 69.99/x - Step 3: Cross multiply
138.51x = 207.78 × 69.99 - Step 4: Simplify right side
138.51x = 14,542.91 - Step 5: Solve for x
x = 14,542.91/138.51 - Step 6: Final answer
x = 104.99
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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.