Finding the Fourth Proportional to 90.05, 134.38 and 79.79
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Solution
The fourth proportional to 90.05, 134.38 and 79.79 is: 119.07
Step by Step Solution
- Step 1: Write the proportion equation
90.05 : 134.38 = 79.79 : x - Step 2: Convert to fraction form
90.05/134.38 = 79.79/x - Step 3: Cross multiply
90.05x = 134.38 × 79.79 - Step 4: Simplify right side
90.05x = 10,722.18 - Step 5: Solve for x
x = 10,722.18/90.05 - Step 6: Final answer
x = 119.07
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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.