Finding the Fourth Proportional to 84.12, 126.36 and 69.06
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Solution
The fourth proportional to 84.12, 126.36 and 69.06 is: 103.74
Step by Step Solution
- Step 1: Write the proportion equation
84.12 : 126.36 = 69.06 : x - Step 2: Convert to fraction form
84.12/126.36 = 69.06/x - Step 3: Cross multiply
84.12x = 126.36 × 69.06 - Step 4: Simplify right side
84.12x = 8,726.42 - Step 5: Solve for x
x = 8,726.42/84.12 - Step 6: Final answer
x = 103.74
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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.