Finding the Fourth Proportional to 138.94, 208.62 and 84.94
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Solution
The fourth proportional to 138.94, 208.62 and 84.94 is: 127.54
Step by Step Solution
- Step 1: Write the proportion equation
138.94 : 208.62 = 84.94 : x - Step 2: Convert to fraction form
138.94/208.62 = 84.94/x - Step 3: Cross multiply
138.94x = 208.62 × 84.94 - Step 4: Simplify right side
138.94x = 17,720.18 - Step 5: Solve for x
x = 17,720.18/138.94 - Step 6: Final answer
x = 127.54
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These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.