Finding the Fourth Proportional to 138.84, 207.26 and 129.74
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Solution
The fourth proportional to 138.84, 207.26 and 129.74 is: 193.68
Step by Step Solution
- Step 1: Write the proportion equation
138.84 : 207.26 = 129.74 : x - Step 2: Convert to fraction form
138.84/207.26 = 129.74/x - Step 3: Cross multiply
138.84x = 207.26 × 129.74 - Step 4: Simplify right side
138.84x = 26,889.91 - Step 5: Solve for x
x = 26,889.91/138.84 - Step 6: Final answer
x = 193.68
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Why These Related Problems?
These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.