Finding the Fourth Proportional to 138.74, 208.08 and 135.68
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Solution
The fourth proportional to 138.74, 208.08 and 135.68 is: 203.49
Step by Step Solution
- Step 1: Write the proportion equation
138.74 : 208.08 = 135.68 : x - Step 2: Convert to fraction form
138.74/208.08 = 135.68/x - Step 3: Cross multiply
138.74x = 208.08 × 135.68 - Step 4: Simplify right side
138.74x = 28,232.29 - Step 5: Solve for x
x = 28,232.29/138.74 - Step 6: Final answer
x = 203.49
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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.