Finding the Fourth Proportional to 84.79, 126.68 and 74.77
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Solution
The fourth proportional to 84.79, 126.68 and 74.77 is: 111.70
Step by Step Solution
- Step 1: Write the proportion equation
84.79 : 126.68 = 74.77 : x - Step 2: Convert to fraction form
84.79/126.68 = 74.77/x - Step 3: Cross multiply
84.79x = 126.68 × 74.77 - Step 4: Simplify right side
84.79x = 9,471.23 - Step 5: Solve for x
x = 9,471.23/84.79 - Step 6: Final answer
x = 111.70
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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.