Finding the Fourth Proportional to 81.93, 113.07 and 55.71
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Solution
The fourth proportional to 81.93, 113.07 and 55.71 is: 76.88
Step by Step Solution
- Step 1: Write the proportion equation
81.93 : 113.07 = 55.71 : x - Step 2: Convert to fraction form
81.93/113.07 = 55.71/x - Step 3: Cross multiply
81.93x = 113.07 × 55.71 - Step 4: Simplify right side
81.93x = 6,299.13 - Step 5: Solve for x
x = 6,299.13/81.93 - Step 6: Final answer
x = 76.88
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Why These Related Problems?
These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.