Finding the Fourth Proportional to 92.67, 138.28 and 78.09
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Solution
The fourth proportional to 92.67, 138.28 and 78.09 is: 116.52
Step by Step Solution
- Step 1: Write the proportion equation
92.67 : 138.28 = 78.09 : x - Step 2: Convert to fraction form
92.67/138.28 = 78.09/x - Step 3: Cross multiply
92.67x = 138.28 × 78.09 - Step 4: Simplify right side
92.67x = 10,798.29 - Step 5: Solve for x
x = 10,798.29/92.67 - Step 6: Final answer
x = 116.52
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Why These Related Problems?
These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.