Finding the Fourth Proportional to 108.21, 149.08 and 77.08
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Solution
The fourth proportional to 108.21, 149.08 and 77.08 is: 106.19
Step by Step Solution
- Step 1: Write the proportion equation
108.21 : 149.08 = 77.08 : x - Step 2: Convert to fraction form
108.21/149.08 = 77.08/x - Step 3: Cross multiply
108.21x = 149.08 × 77.08 - Step 4: Simplify right side
108.21x = 11,490.52 - Step 5: Solve for x
x = 11,490.52/108.21 - Step 6: Final answer
x = 106.19
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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.