Finding the Fourth Proportional to 90.10, 124.20 and 76.96
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Solution
The fourth proportional to 90.10, 124.20 and 76.96 is: 106.09
Step by Step Solution
- Step 1: Write the proportion equation
90.10 : 124.20 = 76.96 : x - Step 2: Convert to fraction form
90.10/124.20 = 76.96/x - Step 3: Cross multiply
90.10x = 124.20 × 76.96 - Step 4: Simplify right side
90.10x = 9,558.43 - Step 5: Solve for x
x = 9,558.43/90.10 - Step 6: Final answer
x = 106.09
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Why These Related Problems?
These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.