Finding the Fourth Proportional to 90.49, 135.42 and 74.05
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Solution
The fourth proportional to 90.49, 135.42 and 74.05 is: 110.81
Step by Step Solution
- Step 1: Write the proportion equation
90.49 : 135.42 = 74.05 : x - Step 2: Convert to fraction form
90.49/135.42 = 74.05/x - Step 3: Cross multiply
90.49x = 135.42 × 74.05 - Step 4: Simplify right side
90.49x = 10,027.17 - Step 5: Solve for x
x = 10,027.17/90.49 - Step 6: Final answer
x = 110.81
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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.