Finding the Fourth Proportional to 90, 134.42 and 76.32
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Solution
The fourth proportional to 90, 134.42 and 76.32 is: 113.99
Step by Step Solution
- Step 1: Write the proportion equation
90 : 134.42 = 76.32 : x - Step 2: Convert to fraction form
90/134.42 = 76.32/x - Step 3: Cross multiply
90x = 134.42 × 76.32 - Step 4: Simplify right side
90x = 10,258.93 - Step 5: Solve for x
x = 10,258.93/90 - Step 6: Final answer
x = 113.99
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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.