Finding the Fourth Proportional to 138.93, 207.99 and 77.99
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Solution
The fourth proportional to 138.93, 207.99 and 77.99 is: 116.75
Step by Step Solution
- Step 1: Write the proportion equation
138.93 : 207.99 = 77.99 : x - Step 2: Convert to fraction form
138.93/207.99 = 77.99/x - Step 3: Cross multiply
138.93x = 207.99 × 77.99 - Step 4: Simplify right side
138.93x = 16,220.10 - Step 5: Solve for x
x = 16,220.10/138.93 - Step 6: Final answer
x = 116.75
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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.