Finding the Fourth Proportional to 81.40, 122.12 and 59.99
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Solution
The fourth proportional to 81.40, 122.12 and 59.99 is: 89.99
Step by Step Solution
- Step 1: Write the proportion equation
81.40 : 122.12 = 59.99 : x - Step 2: Convert to fraction form
81.40/122.12 = 59.99/x - Step 3: Cross multiply
81.40x = 122.12 × 59.99 - Step 4: Simplify right side
81.40x = 7,325.12 - Step 5: Solve for x
x = 7,325.12/81.40 - Step 6: Final answer
x = 89.99
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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.