Finding the Fourth Proportional to 90.12, 135.18 and 69.88
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Solution
The fourth proportional to 90.12, 135.18 and 69.88 is: 104.82
Step by Step Solution
- Step 1: Write the proportion equation
90.12 : 135.18 = 69.88 : x - Step 2: Convert to fraction form
90.12/135.18 = 69.88/x - Step 3: Cross multiply
90.12x = 135.18 × 69.88 - Step 4: Simplify right side
90.12x = 9,446.38 - Step 5: Solve for x
x = 9,446.38/90.12 - Step 6: Final answer
x = 104.82
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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.